| Base | Representation |
|---|---|
| bin | 10011101111110100… |
| … | …100100000101110000 |
| 3 | 2000201200221110222200 |
| 4 | 103233310210011300 |
| 5 | 321411032344440 |
| 6 | 13423554303200 |
| 7 | 1350303644544 |
| oct | 235764440560 |
| 9 | 60650843880 |
| 10 | 21203403120 |
| 11 | 8aa084a659 |
| 12 | 4138b87b00 |
| 13 | 1ccbac10a3 |
| 14 | 105205da24 |
| 15 | 841729c30 |
| hex | 4efd24170 |
21203403120 has 120 divisors (see below), whose sum is σ = 71519604000. Its totient is φ = 5629506048.
The previous prime is 21203403097. The next prime is 21203403127. The reversal of 21203403120 is 2130430212.
21203403120 is a `hidden beast` number, since 2 + 12 + 0 + 340 + 312 + 0 = 666.
It is a tau number, because it is divible by the number of its divisors (120).
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 21203403093 and 21203403102.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21203403127) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100581 + ... + 229179.
It is an arithmetic number, because the mean of its divisors is an integer number (595996700).
Almost surely, 221203403120 is an apocalyptic number.
21203403120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21203403120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35759802000).
21203403120 is an abundant number, since it is smaller than the sum of its proper divisors (50316200880).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21203403120 is a wasteful number, since it uses less digits than its factorization.
21203403120 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 128847 (or 128838 counting only the distinct ones).
The product of its (nonzero) digits is 288, while the sum is 18.
Adding to 21203403120 its reverse (2130430212), we get a palindrome (23333833332).
The spelling of 21203403120 in words is "twenty-one billion, two hundred three million, four hundred three thousand, one hundred twenty".
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