21167350065 has 48 divisors (see below), whose sum is σ = 37569692160. Its totient is φ = 11018972160.

The previous prime is 21167350019. The next prime is 21167350069. The reversal of 21167350065 is 56005376112.

21167350065 is a `hidden beast` number, since 21 + 1 + 6 + 73 + 500 + 65 = 666.

It is not a de Polignac number, because 21167350065 - 2²⁸ = 20898914609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21167350069) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3652320 + ... + 3658110.

It is an arithmetic number, because the mean of its divisors is an integer number (782701920).

Almost surely, 2^21167350065 is an apocalyptic number.

It is an amenable number.

21167350065 is a deficient number, since it is larger than the sum of its proper divisors (16402342095).

21167350065 is a wasteful number, since it uses less digits than its factorization.

21167350065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7734 (or 7731 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The spelling of 21167350065 in words is "twenty-one billion, one hundred sixty-seven million, three hundred fifty thousand, sixty-five".