21021112123200 has 252 divisors, whose sum is σ = 85387424185440. Its totient is φ = 4804825605120.

The previous prime is 21021112123181. The next prime is 21021112123211. The reversal of 21021112123200 is 232121112012.

21021112123200 is a `hidden beast` number, since 2 + 10 + 211 + 121 + 2 + 320 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (252).

It is a super-2 number, since 2×21021112123200² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 104170590 + ... + 104372189.

Almost surely, 2^{21021112123200} is an apocalyptic number.

21021112123200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021112123200 is an abundant number, since it is smaller than the sum of its proper divisors (64366312062240).

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

21021112123200 is a wasteful number, since it uses less digits than its factorization.

21021112123200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208542814 (or 208542796 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21021112123200 its reverse (232121112012), we get a palindrome (21253233235212).

The spelling of 21021112123200 in words is "twenty-one trillion, twenty-one billion, one hundred twelve million, one hundred twenty-three thousand, two hundred".