21822928 has 10 divisors (see below), whose sum is σ = 42281954. Its totient is φ = 10911456.

The previous prime is 21822923. The next prime is 21822943. The reversal of 21822928 is 82922812.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21603904 + 219024 = 4648^2 + 468^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21822893 and 21822902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21822923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 681951 + ... + 681982.

Almost surely, 2^21822928 is an apocalyptic number.

It is an amenable number.

21822928 is a deficient number, since it is larger than the sum of its proper divisors (20459026).

21822928 is a wasteful number, since it uses less digits than its factorization.

21822928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363941 (or 1363935 counting only the distinct ones).

The product of its digits is 9216, while the sum is 34.

The square root of 21822928 is about 4671.5016857537. The cubic root of 21822928 is about 279.4501454106.

The spelling of 21822928 in words is "twenty-one million, eight hundred twenty-two thousand, nine hundred twenty-eight".