21250648 has 16 divisors (see below), whose sum is σ = 39914280. Its totient is φ = 10606848.

The previous prime is 21250637. The next prime is 21250687. The reversal of 21250648 is 84605212.

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, 3411 + ... + 7357.

Almost surely, 2^21250648 is an apocalyptic number.

It is an amenable number.

21250648 is a deficient number, since it is larger than the sum of its proper divisors (18663632).

21250648 is a wasteful number, since it uses less digits than its factorization.

21250648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4626 (or 4622 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21250648 is about 4609.8425135790. The cubic root of 21250648 is about 276.9857282589.

The spelling of 21250648 in words is "twenty-one million, two hundred fifty thousand, six hundred forty-eight".