21021012112200 has 48 divisors (see below), whose sum is σ = 65165137549680. Its totient is φ = 5605603229760.

The previous prime is 21021012112171. The next prime is 21021012112229. The reversal of 21021012112200 is 221121012012.

It is an interprime number because it is at equal distance from previous prime (21021012112171) and next prime (21021012112229).

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 21021012112200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17517509494 + ... + 17517510693.

It is an arithmetic number, because the mean of its divisors is an integer number (1357607032285).

Almost surely, 2^{21021012112200} is an apocalyptic number.

21021012112200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021012112200 is an abundant number, since it is smaller than the sum of its proper divisors (44144125437480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21021012112200 is a wasteful number, since it uses less digits than its factorization.

21021012112200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35035020206 (or 35035020197 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21021012112200 its reverse (221121012012), we get a palindrome (21242133124212).

The spelling of 21021012112200 in words is "twenty-one trillion, twenty-one billion, twelve million, one hundred twelve thousand, two hundred".