21316451163164 has 24 divisors (see below), whose sum is σ = 38277221662176. Its totient is φ = 10380967200000.

The previous prime is 21316451163107. The next prime is 21316451163169. The reversal of 21316451163164 is 46136115461312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21316451163169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108036512 + ... + 108233639.

It is an arithmetic number, because the mean of its divisors is an integer number (1594884235924).

Almost surely, 2^{21316451163164} is an apocalyptic number.

It is an amenable number.

21316451163164 is a deficient number, since it is larger than the sum of its proper divisors (16960770499012).

21316451163164 is a wasteful number, since it uses less digits than its factorization.

21316451163164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216270797 (or 216270795 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The spelling of 21316451163164 in words is "twenty-one trillion, three hundred sixteen billion, four hundred fifty-one million, one hundred sixty-three thousand, one hundred sixty-four".