21192256 has 28 divisors (see below), whose sum is σ = 42377868. Its totient is φ = 10514432.

The previous prime is 21192247. The next prime is 21192271. The reversal of 21192256 is 65229112.

It can be written as a sum of positive squares in 2 ways, for example, as 17505856 + 3686400 = 4184^2 + 1920^2 .

It is a super-2 number, since 2×21192256² = 898223428739072, which contains 22 as substring.

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, 7560 + ... + 9976.

Almost surely, 2^21192256 is an apocalyptic number.

It is an amenable number.

21192256 is a deficient number, since it is larger than the sum of its proper divisors (21185612).

21192256 is a wasteful number, since it uses less digits than its factorization.

21192256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566 (or 2556 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 21192256 is about 4603.5047518168. The cubic root of 21192256 is about 276.7317973789.

The spelling of 21192256 in words is "twenty-one million, one hundred ninety-two thousand, two hundred fifty-six".