12721164 has 12 divisors (see below), whose sum is σ = 29682744. Its totient is φ = 4240384.

The previous prime is 12721157. The next prime is 12721171. The reversal of 12721164 is 46112721.

It is an interprime number because it is at equal distance from previous prime (12721157) and next prime (12721171).

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530037 + ... + 530060.

It is an arithmetic number, because the mean of its divisors is an integer number (2473562).

Almost surely, 2^12721164 is an apocalyptic number.

It is an amenable number.

12721164 is an abundant number, since it is smaller than the sum of its proper divisors (16961580).

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

12721164 is a wasteful number, since it uses less digits than its factorization.

12721164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060104 (or 1060102 counting only the distinct ones).

The product of its digits is 672, while the sum is 24.

The square root of 12721164 is about 3566.6740809892. The cubic root of 12721164 is about 233.4401841687.

Adding to 12721164 its reverse (46112721), we get a palindrome (58833885).

The spelling of 12721164 in words is "twelve million, seven hundred twenty-one thousand, one hundred sixty-four".