21372886 has 16 divisors (see below), whose sum is σ = 32891184. Its totient is φ = 10412064.

The previous prime is 21372839. The next prime is 21372887. The reversal of 21372886 is 68827312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21372887) 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, 16660 + ... + 17896.

It is an arithmetic number, because the mean of its divisors is an integer number (2055699).

Almost surely, 2^21372886 is an apocalyptic number.

21372886 is a deficient number, since it is larger than the sum of its proper divisors (11518298).

21372886 is a wasteful number, since it uses less digits than its factorization.

21372886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455.

The product of its digits is 32256, while the sum is 37.

The square root of 21372886 is about 4623.0818725175. The cubic root of 21372886 is about 277.5158057172.

The spelling of 21372886 in words is "twenty-one million, three hundred seventy-two thousand, eight hundred eighty-six".