21372758 has 16 divisors (see below), whose sum is σ = 36815040. Its totient is φ = 9203400.

The previous prime is 21372737. The next prime is 21372761. The reversal of 21372758 is 85727312.

It is a Curzon number.

It is a congruent number.

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, 25148 + ... + 25983.

It is an arithmetic number, because the mean of its divisors is an integer number (2300940).

Almost surely, 2^21372758 is an apocalyptic number.

21372758 is a deficient number, since it is larger than the sum of its proper divisors (15442282).

21372758 is a wasteful number, since it uses less digits than its factorization.

21372758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51163.

The product of its digits is 23520, while the sum is 35.

The square root of 21372758 is about 4623.0680289176. The cubic root of 21372758 is about 277.5152517116.

The spelling of 21372758 in words is "twenty-one million, three hundred seventy-two thousand, seven hundred fifty-eight".