21248704 has 14 divisors (see below), whose sum is σ = 42165524. Its totient is φ = 10624320.

The previous prime is 21248699. The next prime is 21248713. The reversal of 21248704 is 40784212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165942 + ... + 166069.

Almost surely, 2^21248704 is an apocalyptic number.

It is an amenable number.

21248704 is a deficient number, since it is larger than the sum of its proper divisors (20916820).

21248704 is an equidigital number, since it uses as much as digits as its factorization.

21248704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332023 (or 332013 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 21248704 is about 4609.6316555664. The cubic root of 21248704 is about 276.9772818236.

It can be divided in two parts, 21248 and 704, that added together give a cube (21952 = 28³).

The spelling of 21248704 in words is "twenty-one million, two hundred forty-eight thousand, seven hundred four".