21100211012120 has 32 divisors (see below), whose sum is σ = 47480660211600. Its totient is φ = 8439162549888.

The previous prime is 21100211012117. The next prime is 21100211012131. The reversal of 21100211012120 is 2121011200112.

It is a super-2 number, since 2×21100211012120² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21100211012095 and 21100211012104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28437110 + ... + 29169669.

Almost surely, 2^{21100211012120} is an apocalyptic number.

21100211012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100211012120 is an abundant number, since it is smaller than the sum of its proper divisors (26380449199480).

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

21100211012120 is a wasteful number, since it uses less digits than its factorization.

21100211012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57615947 (or 57615943 counting only the distinct ones).

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

Adding to 21100211012120 its reverse (2121011200112), we get a palindrome (23221222212232).

The spelling of 21100211012120 in words is "twenty-one trillion, one hundred billion, two hundred eleven million, twelve thousand, one hundred twenty".