21064412 has 12 divisors (see below), whose sum is σ = 38465616. Its totient is φ = 10074240.

The previous prime is 21064363. The next prime is 21064471. The reversal of 21064412 is 21446012.

It is a congruent number.

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, 114389 + ... + 114572.

It is an arithmetic number, because the mean of its divisors is an integer number (3205468).

Almost surely, 2^21064412 is an apocalyptic number.

It is an amenable number.

21064412 is a deficient number, since it is larger than the sum of its proper divisors (17401204).

21064412 is a wasteful number, since it uses less digits than its factorization.

21064412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228988 (or 228986 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21064412 is about 4589.5982394977. The cubic root of 21064412 is about 276.1742056417.

The spelling of 21064412 in words is "twenty-one million, sixty-four thousand, four hundred twelve".