21154532365164 has 96 divisors (see below), whose sum is σ = 55587563845632. Its totient is φ = 6203381184000.

The previous prime is 21154532365159. The next prime is 21154532365171. The reversal of 21154532365164 is 46156323545112.

It is a happy number.

It is a super-4 number, since 4×21154532365164⁴ (a number of 54 digits) contains 4444 as substring.

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 31 ways as a sum of consecutive naturals, for example, 95318694 + ... + 95540370.

It is an arithmetic number, because the mean of its divisors is an integer number (579037123392).

Almost surely, 2^{21154532365164} is an apocalyptic number.

It is an amenable number.

21154532365164 is an abundant number, since it is smaller than the sum of its proper divisors (34433031480468).

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

21154532365164 is a wasteful number, since it uses less digits than its factorization.

21154532365164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245047 (or 245045 counting only the distinct ones).

The product of its digits is 2592000, while the sum is 48.

The spelling of 21154532365164 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred thirty-two million, three hundred sixty-five thousand, one hundred sixty-four".