21332548 has 24 divisors (see below), whose sum is σ = 38368512. Its totient is φ = 10373184.

The previous prime is 21332537. The next prime is 21332551. The reversal of 21332548 is 84523312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43561 + ... + 44047.

It is an arithmetic number, because the mean of its divisors is an integer number (1598688).

Almost surely, 2^21332548 is an apocalyptic number.

It is an amenable number.

21332548 is a deficient number, since it is larger than the sum of its proper divisors (17035964).

21332548 is a wasteful number, since it uses less digits than its factorization.

21332548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 769 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 21332548 is about 4618.7171379075. The cubic root of 21332548 is about 277.3411064502.

It can be divided in two parts, 213 and 32548, that added together give a square (32761 = 181²).

The spelling of 21332548 in words is "twenty-one million, three hundred thirty-two thousand, five hundred forty-eight".