21586364 has 6 divisors (see below), whose sum is σ = 37776144. Its totient is φ = 10793180.

The previous prime is 21586363. The next prime is 21586373. The reversal of 21586364 is 46368512.

It is a super-2 number, since 2×21586364² = 931942221480992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21586363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2698292 + ... + 2698299.

It is an arithmetic number, because the mean of its divisors is an integer number (6296024).

Almost surely, 2^21586364 is an apocalyptic number.

It is an amenable number.

21586364 is a deficient number, since it is larger than the sum of its proper divisors (16189780).

21586364 is a wasteful number, since it uses less digits than its factorization.

21586364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5396595 (or 5396593 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 21586364 is about 4646.1127838226. The cubic root of 21586364 is about 278.4367133234.

The spelling of 21586364 in words is "twenty-one million, five hundred eighty-six thousand, three hundred sixty-four".