21112001012120 has 32 divisors (see below), whose sum is σ = 47937800473200. Its totient is φ = 8367325170048.

The previous prime is 21112001012093. The next prime is 21112001012147. The reversal of 21112001012120 is 2121010021112.

It is an interprime number because it is at equal distance from previous prime (21112001012093) and next prime (21112001012147).

It is a junction number, because it is equal to n+sod(n) for n = 21112001012095 and 21112001012104.

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, 2421096674 + ... + 2421105393.

Almost surely, 2^{21112001012120} is an apocalyptic number.

21112001012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112001012120 is an abundant number, since it is smaller than the sum of its proper divisors (26825799461080).

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

21112001012120 is a wasteful number, since it uses less digits than its factorization.

21112001012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4842202187 (or 4842202183 counting only the distinct ones).

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

Adding to 21112001012120 its reverse (2121010021112), we get a palindrome (23233011033232).

The spelling of 21112001012120 in words is "twenty-one trillion, one hundred twelve billion, one million, twelve thousand, one hundred twenty".