21897048 has 32 divisors (see below), whose sum is σ = 55643760. Its totient is φ = 7178880.

The previous prime is 21897017. The next prime is 21897053. The reversal of 21897048 is 84079812.

It is a super-2 number, since 2×21897048² = 958961422228608, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21896997 and 21897015.

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 7 ways as a sum of consecutive naturals, for example, 6015 + ... + 8942.

Almost surely, 2^21897048 is an apocalyptic number.

It is an amenable number.

21897048 is an abundant number, since it is smaller than the sum of its proper divisors (33746712).

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

21897048 is a wasteful number, since it uses less digits than its factorization.

21897048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15027 (or 15023 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 21897048 is about 4679.4281701934. The cubic root of 21897048 is about 279.7661653177.

The spelling of 21897048 in words is "twenty-one million, eight hundred ninety-seven thousand, forty-eight".