21121210212200 has 96 divisors (see below), whose sum is σ = 56124225379200. Its totient is φ = 7241280042240.

The previous prime is 21121210212197. The next prime is 21121210212209. The reversal of 21121210212200 is 221201212112.

It is a super-2 number, since 2×21121210212200² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121210212209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38038166 + ... + 38589434.

It is an arithmetic number, because the mean of its divisors is an integer number (584627347700).

Almost surely, 2^{21121210212200} is an apocalyptic number.

21121210212200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121210212200 is an abundant number, since it is smaller than the sum of its proper divisors (35003015167000).

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

21121210212200 is a wasteful number, since it uses less digits than its factorization.

21121210212200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578659 (or 578650 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21121210212200 its reverse (221201212112), we get a palindrome (21342411424312).

The spelling of 21121210212200 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred ten million, two hundred twelve thousand, two hundred".