21164495 has 16 divisors (see below), whose sum is σ = 28062720. Its totient is φ = 15194400.

The previous prime is 21164489. The next prime is 21164501. The reversal of 21164495 is 59446112.

It is an interprime number because it is at equal distance from previous prime (21164489) and next prime (21164501).

It is not a de Polignac number, because 21164495 - 2⁶ = 21164431 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1910 + ... + 6780.

It is an arithmetic number, because the mean of its divisors is an integer number (1753920).

Almost surely, 2^21164495 is an apocalyptic number.

21164495 is a deficient number, since it is larger than the sum of its proper divisors (6898225).

21164495 is a wasteful number, since it uses less digits than its factorization.

21164495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4966.

The product of its digits is 8640, while the sum is 32.

The square root of 21164495 is about 4600.4885610118. The cubic root of 21164495 is about 276.6109087488.

The spelling of 21164495 in words is "twenty-one million, one hundred sixty-four thousand, four hundred ninety-five".