21373562 has 16 divisors (see below), whose sum is σ = 37020480. Its totient is φ = 9065088.

The previous prime is 21373559. The next prime is 21373577. The reversal of 21373562 is 26537312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6512 + ... + 9227.

It is an arithmetic number, because the mean of its divisors is an integer number (2313780).

Almost surely, 2^21373562 is an apocalyptic number.

21373562 is a deficient number, since it is larger than the sum of its proper divisors (15646918).

21373562 is a wasteful number, since it uses less digits than its factorization.

21373562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15845.

The product of its digits is 7560, while the sum is 29.

The square root of 21373562 is about 4623.1549833420. The cubic root of 21373562 is about 277.5187315224.

The spelling of 21373562 in words is "twenty-one million, three hundred seventy-three thousand, five hundred sixty-two".