21164501036 has 24 divisors (see below), whose sum is σ = 42332616480. Its totient is φ = 9069725952.

The previous prime is 21164501021. The next prime is 21164501089. The reversal of 21164501036 is 63010546112.

It is a happy number.

It is a super-2 number, since 2×21164501036² (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, 405860 + ... + 455028.

It is an arithmetic number, because the mean of its divisors is an integer number (1763859020).

Almost surely, 2^21164501036 is an apocalyptic number.

It is an amenable number.

21164501036 is an abundant number, since it is smaller than the sum of its proper divisors (21168115444).

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

21164501036 is a wasteful number, since it uses less digits than its factorization.

21164501036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64553 (or 64551 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21164501036 in words is "twenty-one billion, one hundred sixty-four million, five hundred one thousand, thirty-six".