21164704 has 24 divisors (see below), whose sum is σ = 45456768. Its totient is φ = 9620160.

The previous prime is 21164687. The next prime is 21164713. The reversal of 21164704 is 40746112.

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, 29712 + ... + 30415.

It is an arithmetic number, because the mean of its divisors is an integer number (1894032).

Almost surely, 2^21164704 is an apocalyptic number.

It is an amenable number.

21164704 is an abundant number, since it is smaller than the sum of its proper divisors (24292064).

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

21164704 is a wasteful number, since it uses less digits than its factorization.

21164704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60148 (or 60140 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21164704 is about 4600.5112759344. The cubic root of 21164704 is about 276.6118192593.

The spelling of 21164704 in words is "twenty-one million, one hundred sixty-four thousand, seven hundred four".