| Base | Representation |
|---|---|
| bin | 10011101011000010… |
| … | …100111110100010000 |
| 3 | 2000112010000212011200 |
| 4 | 103223002213310100 |
| 5 | 321230014433240 |
| 6 | 13412011311200 |
| 7 | 1345311154143 |
| oct | 235302476420 |
| 9 | 60463025150 |
| 10 | 21123202320 |
| 11 | 8a5a551600 |
| 12 | 411614b500 |
| 13 | 1cb82c04ac |
| 14 | 104554405a |
| 15 | 839686930 |
| hex | 4eb0a7d10 |
21123202320 has 360 divisors, whose sum is σ = 80093628888. Its totient is φ = 4981616640.
The previous prime is 21123202319. The next prime is 21123202327. The reversal of 21123202320 is 2320232112.
21123202320 is a `hidden beast` number, since 2 + 112 + 320 + 232 + 0 = 666.
It can be written as a sum of positive squares in 4 ways, for example, as 4286582784 + 16836619536 = 65472^2 + 129756^2 .
It is a tau number, because it is divible by the number of its divisors (360).
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 = 21123202293 and 21123202302.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21123202327) by changing a digit.
It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3220164 + ... + 3226716.
Almost surely, 221123202320 is an apocalyptic number.
21123202320 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 21123202320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40046814444).
21123202320 is an abundant number, since it is smaller than the sum of its proper divisors (58970426568).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21123202320 is a wasteful number, since it uses less digits than its factorization.
21123202320 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 6631 (or 6611 counting only the distinct ones).
The product of its (nonzero) digits is 288, while the sum is 18.
Adding to 21123202320 its reverse (2320232112), we get a palindrome (23443434432).
The spelling of 21123202320 in words is "twenty-one billion, one hundred twenty-three million, two hundred two thousand, three hundred twenty".
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