21164304012 has 24 divisors (see below), whose sum is σ = 49444441200. Its totient is φ = 7046044416.

The previous prime is 21164303989. The next prime is 21164304047. The reversal of 21164304012 is 21040346112.

It is a super-2 number, since 2×21164304012² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1080337 + ... + 1099752.

It is an arithmetic number, because the mean of its divisors is an integer number (2060185050).

Almost surely, 2^21164304012 is an apocalyptic number.

It is an amenable number.

21164304012 is an abundant number, since it is smaller than the sum of its proper divisors (28280137188).

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

21164304012 is a wasteful number, since it uses less digits than its factorization.

21164304012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180905 (or 2180903 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The spelling of 21164304012 in words is "twenty-one billion, one hundred sixty-four million, three hundred four thousand, twelve".