21067164 has 18 divisors (see below), whose sum is σ = 53253200. Its totient is φ = 7022376.

The previous prime is 21067159. The next prime is 21067177. The reversal of 21067164 is 46176012.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

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, 292564 + ... + 292635.

Almost surely, 2^21067164 is an apocalyptic number.

It is an amenable number.

21067164 is an abundant number, since it is smaller than the sum of its proper divisors (32186036).

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

21067164 is a wasteful number, since it uses less digits than its factorization.

21067164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585209 (or 585204 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21067164 is about 4589.8980380832. The cubic root of 21067164 is about 276.1862322187.

The spelling of 21067164 in words is "twenty-one million, sixty-seven thousand, one hundred sixty-four".