21012020011120 has 40 divisors (see below), whose sum is σ = 50976987683616. Its totient is φ = 8039381568768.

The previous prime is 21012020011117. The next prime is 21012020011127. The reversal of 21012020011120 is 2111002021012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 21012020011120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012020011127) 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, 5709786207 + ... + 5709789886.

Almost surely, 2^{21012020011120} is an apocalyptic number.

21012020011120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012020011120 is an abundant number, since it is smaller than the sum of its proper divisors (29964967672496).

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

21012020011120 is a wasteful number, since it uses less digits than its factorization.

21012020011120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11419576129 (or 11419576123 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21012020011120 its reverse (2111002021012), we get a palindrome (23123022032132).

The spelling of 21012020011120 in words is "twenty-one trillion, twelve billion, twenty million, eleven thousand, one hundred twenty".