21701164 has 18 divisors (see below), whose sum is σ = 39337844. Its totient is φ = 10474800.

The previous prime is 21701159. The next prime is 21701179. The reversal of 21701164 is 46110712.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139 + ... + 6589.

Almost surely, 2^21701164 is an apocalyptic number.

It is an amenable number.

21701164 is a deficient number, since it is larger than the sum of its proper divisors (17636680).

21701164 is a wasteful number, since it uses less digits than its factorization.

21701164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6513 (or 6482 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21701164 is about 4658.4508154536. The cubic root of 21701164 is about 278.9294323568.

Adding to 21701164 its reverse (46110712), we get a palindrome (67811876).

The spelling of 21701164 in words is "twenty-one million, seven hundred one thousand, one hundred sixty-four".