21522832 has 10 divisors (see below), whose sum is σ = 41700518. Its totient is φ = 10761408.

The previous prime is 21522829. The next prime is 21522859. The reversal of 21522832 is 23822512.

It can be written as a sum of positive squares in only one way, i.e., 13660416 + 7862416 = 3696^2 + 2804^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21522797 and 21522806.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672573 + ... + 672604.

Almost surely, 2^21522832 is an apocalyptic number.

It is an amenable number.

21522832 is a deficient number, since it is larger than the sum of its proper divisors (20177686).

21522832 is a wasteful number, since it uses less digits than its factorization.

21522832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345185 (or 1345179 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 21522832 is about 4639.2706323300. The cubic root of 21522832 is about 278.1632841631.

The spelling of 21522832 in words is "twenty-one million, five hundred twenty-two thousand, eight hundred thirty-two".