21013010100120 has 64 divisors (see below), whose sum is σ = 63747334044000. Its totient is φ = 5540509027328.

The previous prime is 21013010100083. The next prime is 21013010100149. The reversal of 21013010100120 is 2100101031012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21013010100096 and 21013010100105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 983744475 + ... + 983765834.

Almost surely, 2^{21013010100120} is an apocalyptic number.

21013010100120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013010100120 is an abundant number, since it is smaller than the sum of its proper divisors (42734323943880).

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

21013010100120 is a wasteful number, since it uses less digits than its factorization.

21013010100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967510412 (or 1967510408 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21013010100120 its reverse (2100101031012), we get a palindrome (23113111131132).

The spelling of 21013010100120 in words is "twenty-one trillion, thirteen billion, ten million, one hundred thousand, one hundred twenty".