21873370 has 16 divisors (see below), whose sum is σ = 41444640. Its totient is φ = 8288784.

The previous prime is 21873361. The next prime is 21873409. The reversal of 21873370 is 7337812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57372 + ... + 57751.

It is an arithmetic number, because the mean of its divisors is an integer number (2590290).

Almost surely, 2^21873370 is an apocalyptic number.

21873370 is a deficient number, since it is larger than the sum of its proper divisors (19571270).

21873370 is a wasteful number, since it uses less digits than its factorization.

21873370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115149.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 21873370 is about 4676.8974758915. The cubic root of 21873370 is about 279.6652888222.

The spelling of 21873370 in words is "twenty-one million, eight hundred seventy-three thousand, three hundred seventy".