21470744 has 16 divisors (see below), whose sum is σ = 40306920. Its totient is φ = 10722240.

The previous prime is 21470737. The next prime is 21470783. The reversal of 21470744 is 44707412.

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, 11372 + ... + 13124.

Almost surely, 2^21470744 is an apocalyptic number.

It is an amenable number.

21470744 is a deficient number, since it is larger than the sum of its proper divisors (18836176).

21470744 is a wasteful number, since it uses less digits than its factorization.

21470744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290 (or 3286 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 29.

The square root of 21470744 is about 4633.6534182004. The cubic root of 21470744 is about 277.9387060147.

The spelling of 21470744 in words is "twenty-one million, four hundred seventy thousand, seven hundred forty-four".