21020211012112 has 40 divisors (see below), whose sum is σ = 43964155488960. Its totient is φ = 9678481549440.

The previous prime is 21020211012107. The next prime is 21020211012113. The reversal of 21020211012112 is 21121011202012.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21020211012113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120507964 + ... + 120682267.

It is an arithmetic number, because the mean of its divisors is an integer number (1099103887224).

Almost surely, 2^{21020211012112} is an apocalyptic number.

It is an amenable number.

21020211012112 is an abundant number, since it is smaller than the sum of its proper divisors (22943944476848).

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

21020211012112 is a wasteful number, since it uses less digits than its factorization.

21020211012112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241190671 (or 241190665 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21020211012112 its reverse (21121011202012), we get a palindrome (42141222214124).

The spelling of 21020211012112 in words is "twenty-one trillion, twenty billion, two hundred eleven million, twelve thousand, one hundred twelve".