21702248 has 32 divisors (see below), whose sum is σ = 43027200. Its totient is φ = 10241088.

The previous prime is 21702221. The next prime is 21702253. The reversal of 21702248 is 84220712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13790 + ... + 15282.

It is an arithmetic number, because the mean of its divisors is an integer number (1344600).

Almost surely, 2^21702248 is an apocalyptic number.

It is an amenable number.

21702248 is a deficient number, since it is larger than the sum of its proper divisors (21324952).

21702248 is a wasteful number, since it uses less digits than its factorization.

21702248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601 (or 1597 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 21702248 is about 4658.5671616925. The cubic root of 21702248 is about 278.9340765696.

The spelling of 21702248 in words is "twenty-one million, seven hundred two thousand, two hundred forty-eight".