21913286 has 8 divisors (see below), whose sum is σ = 33320424. Its totient is φ = 10806480.

The previous prime is 21913277. The next prime is 21913291. The reversal of 21913286 is 68231912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74900 + ... + 75191.

It is an arithmetic number, because the mean of its divisors is an integer number (4165053).

Almost surely, 2^21913286 is an apocalyptic number.

21913286 is a deficient number, since it is larger than the sum of its proper divisors (11407138).

21913286 is a wasteful number, since it uses less digits than its factorization.

21913286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150166.

The product of its digits is 5184, while the sum is 32.

The square root of 21913286 is about 4681.1628897102. The cubic root of 21913286 is about 279.8353028033.

The spelling of 21913286 in words is "twenty-one million, nine hundred thirteen thousand, two hundred eighty-six".