21164038 has 16 divisors (see below), whose sum is σ = 36449280. Its totient is φ = 9028296.

The previous prime is 21164029. The next prime is 21164047. The reversal of 21164038 is 83046112.

It is an interprime number because it is at equal distance from previous prime (21164029) and next prime (21164047).

It is a congruent number.

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, 268 + ... + 6511.

It is an arithmetic number, because the mean of its divisors is an integer number (2278080).

Almost surely, 2^21164038 is an apocalyptic number.

21164038 is a deficient number, since it is larger than the sum of its proper divisors (15285242).

21164038 is a wasteful number, since it uses less digits than its factorization.

21164038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7011.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21164038 is about 4600.4388921058. The cubic root of 21164038 is about 276.6089178028.

The spelling of 21164038 in words is "twenty-one million, one hundred sixty-four thousand, thirty-eight".