21413986 has 16 divisors (see below), whose sum is σ = 35183808. Its totient is φ = 9694000.

The previous prime is 21413971. The next prime is 21413993. The reversal of 21413986 is 68931412.

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, 3936 + ... + 7636.

It is an arithmetic number, because the mean of its divisors is an integer number (2198988).

Almost surely, 2^21413986 is an apocalyptic number.

21413986 is a deficient number, since it is larger than the sum of its proper divisors (13769822).

21413986 is a wasteful number, since it uses less digits than its factorization.

21413986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977.

The product of its digits is 10368, while the sum is 34.

The square root of 21413986 is about 4627.5248243526. The cubic root of 21413986 is about 277.6935791859.

The spelling of 21413986 in words is "twenty-one million, four hundred thirteen thousand, nine hundred eighty-six".