21210112120100 has 72 divisors (see below), whose sum is σ = 47070022742400. Its totient is φ = 8293714416000.

The previous prime is 21210112120069. The next prime is 21210112120117. The reversal of 21210112120100 is 102121101212.

It is a super-2 number, since 2×21210112120100² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12493310 + ... + 14089109.

Almost surely, 2^{21210112120100} is an apocalyptic number.

21210112120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210112120100 is an abundant number, since it is smaller than the sum of its proper divisors (25859910622300).

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

21210112120100 is a wasteful number, since it uses less digits than its factorization.

21210112120100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26582613 (or 26582606 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21210112120100 its reverse (102121101212), we get a palindrome (21312233221312).

The spelling of 21210112120100 in words is "twenty-one trillion, two hundred ten billion, one hundred twelve million, one hundred twenty thousand, one hundred".