21012113113320 has 128 divisors (see below), whose sum is σ = 72092161290240. Its totient is φ = 4799393337600.

The previous prime is 21012113113213. The next prime is 21012113113357. The reversal of 21012113113320 is 2331131121012.

It is a super-2 number, since 2×21012113113320² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7594006 + ... + 9984645.

It is an arithmetic number, because the mean of its divisors is an integer number (563220010080).

Almost surely, 2^{21012113113320} is an apocalyptic number.

21012113113320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012113113320 is an abundant number, since it is smaller than the sum of its proper divisors (51080048176920).

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

21012113113320 is a wasteful number, since it uses less digits than its factorization.

21012113113320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17580095 (or 17580091 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21012113113320 its reverse (2331131121012), we get a palindrome (23343244234332).

The spelling of 21012113113320 in words is "twenty-one trillion, twelve billion, one hundred thirteen million, one hundred thirteen thousand, three hundred twenty".