21572248 has 16 divisors (see below), whose sum is σ = 41309280. Its totient is φ = 10556448.

The previous prime is 21572237. The next prime is 21572251. The reversal of 21572248 is 84227512.

It is a happy number.

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, 28311 + ... + 29062.

It is an arithmetic number, because the mean of its divisors is an integer number (2581830).

Almost surely, 2^21572248 is an apocalyptic number.

It is an amenable number.

21572248 is a deficient number, since it is larger than the sum of its proper divisors (19737032).

21572248 is a wasteful number, since it uses less digits than its factorization.

21572248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57426 (or 57422 counting only the distinct ones).

The product of its digits is 8960, while the sum is 31.

The square root of 21572248 is about 4644.5934160053. The cubic root of 21572248 is about 278.3760072577.

The spelling of 21572248 in words is "twenty-one million, five hundred seventy-two thousand, two hundred forty-eight".