21579064 has 16 divisors (see below), whose sum is σ = 43573320. Its totient is φ = 9959520.

The previous prime is 21579059. The next prime is 21579067. The reversal of 21579064 is 46097512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21579067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103642 + ... + 103849.

Almost surely, 2^21579064 is an apocalyptic number.

It is an amenable number.

21579064 is an abundant number, since it is smaller than the sum of its proper divisors (21994256).

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

21579064 is a wasteful number, since it uses less digits than its factorization.

21579064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207510 (or 207506 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 21579064 is about 4645.3271144237. The cubic root of 21579064 is about 278.4053228713.

The spelling of 21579064 in words is "twenty-one million, five hundred seventy-nine thousand, sixty-four".