21112012221985 has 16 divisors (see below), whose sum is σ = 25812850369536. Its totient is φ = 16570663207488.

The previous prime is 21112012221947. The next prime is 21112012221997. The reversal of 21112012221985 is 58912221021112.

It is a cyclic number.

It is not a de Polignac number, because 21112012221985 - 2³³ = 21103422287393 is a prime.

It is a super-2 number, since 2×21112012221985² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16163632 + ... + 17420878.

It is an arithmetic number, because the mean of its divisors is an integer number (1613303148096).

Almost surely, 2^{21112012221985} is an apocalyptic number.

It is an amenable number.

21112012221985 is a deficient number, since it is larger than the sum of its proper divisors (4700838147551).

21112012221985 is a wasteful number, since it uses less digits than its factorization.

21112012221985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320672.

The product of its (nonzero) digits is 11520, while the sum is 37.

The spelling of 21112012221985 in words is "twenty-one trillion, one hundred twelve billion, twelve million, two hundred twenty-one thousand, nine hundred eighty-five".