21264286 has 8 divisors (see below), whose sum is σ = 32014944. Its totient is φ = 10592640.

The previous prime is 21264251. The next prime is 21264293. The reversal of 21264286 is 68246212.

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

It is a plaindrome in base 16.

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, 19075 + ... + 20158.

It is an arithmetic number, because the mean of its divisors is an integer number (4001868).

Almost surely, 2^21264286 is an apocalyptic number.

21264286 is a deficient number, since it is larger than the sum of its proper divisors (10750658).

21264286 is a wasteful number, since it uses less digits than its factorization.

21264286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39506.

The product of its digits is 9216, while the sum is 31.

The square root of 21264286 is about 4611.3215025630. The cubic root of 21264286 is about 277.0449691748.

The spelling of 21264286 in words is "twenty-one million, two hundred sixty-four thousand, two hundred eighty-six".