21923648 has 28 divisors (see below), whose sum is σ = 43654980. Its totient is φ = 10924032.

The previous prime is 21923639. The next prime is 21923683. The reversal of 21923648 is 84632912.

It can be written as a sum of positive squares in 2 ways, for example, as 12730624 + 9193024 = 3568^2 + 3032^2 .

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, 32240 + ... + 32912.

Almost surely, 2^21923648 is an apocalyptic number.

It is an amenable number.

21923648 is a deficient number, since it is larger than the sum of its proper divisors (21731332).

21923648 is an equidigital number, since it uses as much as digits as its factorization.

21923648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194 (or 1184 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 21923648 is about 4682.2695351720. The cubic root of 21923648 is about 279.8794038489.

The spelling of 21923648 in words is "twenty-one million, nine hundred twenty-three thousand, six hundred forty-eight".