21463986 has 32 divisors (see below), whose sum is σ = 44064000. Its totient is φ = 6968016.

The previous prime is 21463969. The next prime is 21463999. The reversal of 21463986 is 68936412.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42765 + ... + 43263.

It is an arithmetic number, because the mean of its divisors is an integer number (1377000).

Almost surely, 2^21463986 is an apocalyptic number.

21463986 is an abundant number, since it is smaller than the sum of its proper divisors (22600014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21463986 is a wasteful number, since it uses less digits than its factorization.

21463986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678.

The product of its digits is 62208, while the sum is 39.

The square root of 21463986 is about 4632.9241306112. The cubic root of 21463986 is about 277.9095421926.

The spelling of 21463986 in words is "twenty-one million, four hundred sixty-three thousand, nine hundred eighty-six".