21372548 has 24 divisors (see below), whose sum is σ = 38593632. Its totient is φ = 10350144.

The previous prime is 21372541. The next prime is 21372551. The reversal of 21372548 is 84527312.

It is not an unprimeable number, because it can be changed into a prime (21372541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23111 + ... + 24017.

It is an arithmetic number, because the mean of its divisors is an integer number (1608068).

Almost surely, 2^21372548 is an apocalyptic number.

It is an amenable number.

21372548 is a deficient number, since it is larger than the sum of its proper divisors (17221084).

21372548 is a wasteful number, since it uses less digits than its factorization.

21372548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091 (or 1089 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 21372548 is about 4623.0453166717. The cubic root of 21372548 is about 277.5143427914.

The spelling of 21372548 in words is "twenty-one million, three hundred seventy-two thousand, five hundred forty-eight".