21710748 has 12 divisors (see below), whose sum is σ = 50658440. Its totient is φ = 7236912.

The previous prime is 21710737. The next prime is 21710753. The reversal of 21710748 is 84701712.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904603 + ... + 904626.

Almost surely, 2^21710748 is an apocalyptic number.

It is an amenable number.

21710748 is an abundant number, since it is smaller than the sum of its proper divisors (28947692).

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

21710748 is a wasteful number, since it uses less digits than its factorization.

21710748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809236 (or 1809234 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 21710748 is about 4659.4793700584. The cubic root of 21710748 is about 278.9704880078.

The spelling of 21710748 in words is "twenty-one million, seven hundred ten thousand, seven hundred forty-eight".