21372386 has 16 divisors (see below), whose sum is σ = 36699264. Its totient is φ = 9144384.

The previous prime is 21372367. The next prime is 21372413. The reversal of 21372386 is 68327312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12986 + ... + 14538.

It is an arithmetic number, because the mean of its divisors is an integer number (2293704).

Almost surely, 2^21372386 is an apocalyptic number.

21372386 is a deficient number, since it is larger than the sum of its proper divisors (15326878).

21372386 is a wasteful number, since it uses less digits than its factorization.

21372386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545.

The product of its digits is 12096, while the sum is 32.

The square root of 21372386 is about 4623.0277957200. The cubic root of 21372386 is about 277.5136416203.

Adding to 21372386 its reverse (68327312), we get a palindrome (89699698).

The spelling of 21372386 in words is "twenty-one million, three hundred seventy-two thousand, three hundred eighty-six".