| Base | Representation |
|---|---|
| bin | 1001100011110011000010… |
| … | …10001110111101101010000 |
| 3 | 2202102121101201020012111020 |
| 4 | 10301321201101313231100 |
| 5 | 10223402410204134300 |
| 6 | 112413001253315440 |
| 7 | 4266505661001543 |
| oct | 461714121675520 |
| 9 | 82377351205436 |
| 10 | 21021202021200 |
| 11 | 67750505792a7 |
| 12 | 2436072035b80 |
| 13 | b963a1ca8644 |
| 14 | 52960848485a |
| 15 | 266c22b528a0 |
| hex | 131e61477b50 |
21021202021200 has 240 divisors, whose sum is σ = 68824216843200. Its totient is φ = 5482951372800.
The previous prime is 21021202021151. The next prime is 21021202021213. The reversal of 21021202021200 is 212020212012.
It is a tau number, because it is divible by the number of its divisors (240).
It is a super-2 number, since 2×210212020212002 (a number of 27 digits) contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (15).
It is a self number, because there is not a number n which added to its sum of digits gives 21021202021200.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12300636 + ... + 13904964.
It is an arithmetic number, because the mean of its divisors is an integer number (286767570180).
Almost surely, 221021202021200 is an apocalyptic number.
21021202021200 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 21021202021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34412108421600).
21021202021200 is an abundant number, since it is smaller than the sum of its proper divisors (47803014822000).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21021202021200 is a wasteful number, since it uses less digits than its factorization.
21021202021200 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1604590 (or 1604579 counting only the distinct ones).
The product of its (nonzero) digits is 64, while the sum is 15.
Adding to 21021202021200 its reverse (212020212012), we get a palindrome (21233222233212).
The spelling of 21021202021200 in words is "twenty-one trillion, twenty-one billion, two hundred two million, twenty-one thousand, two hundred".
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