21012110012120 has 32 divisors (see below), whose sum is σ = 47617371622800. Its totient is φ = 8344377499008.

The previous prime is 21012110012093. The next prime is 21012110012129. The reversal of 21012110012120 is 2121001121012.

It is a super-2 number, since 2×21012110012120² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21012110012095 and 21012110012104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012110012129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1889572679 + ... + 1889583798.

Almost surely, 2^{21012110012120} is an apocalyptic number.

21012110012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012110012120 is an abundant number, since it is smaller than the sum of its proper divisors (26605261610680).

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

21012110012120 is a wasteful number, since it uses less digits than its factorization.

21012110012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3779156627 (or 3779156623 counting only the distinct ones).

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

Adding to 21012110012120 its reverse (2121001121012), we get a palindrome (23133111133132).

The spelling of 21012110012120 in words is "twenty-one trillion, twelve billion, one hundred ten million, twelve thousand, one hundred twenty".