21086366 has 24 divisors (see below), whose sum is σ = 37168560. Its totient is φ = 8944992.

The previous prime is 21086347. The next prime is 21086381. The reversal of 21086366 is 66368012.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9050 + ... + 11138.

It is an arithmetic number, because the mean of its divisors is an integer number (1548690).

Almost surely, 2^21086366 is an apocalyptic number.

21086366 is a deficient number, since it is larger than the sum of its proper divisors (16082194).

21086366 is a wasteful number, since it uses less digits than its factorization.

21086366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208 (or 2201 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 21086366 is about 4591.9893292559. The cubic root of 21086366 is about 276.2701181748.

The spelling of 21086366 in words is "twenty-one million, eighty-six thousand, three hundred sixty-six".