21312862 has 8 divisors (see below), whose sum is σ = 31994856. Its totient is φ = 10647912.

The previous prime is 21312833. The next prime is 21312871. The reversal of 21312862 is 26821312.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453 + ... + 6544.

It is an arithmetic number, because the mean of its divisors is an integer number (3999357).

Almost surely, 2^21312862 is an apocalyptic number.

21312862 is a deficient number, since it is larger than the sum of its proper divisors (10681994).

21312862 is a wasteful number, since it uses less digits than its factorization.

21312862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8522.

The product of its digits is 1152, while the sum is 25.

The square root of 21312862 is about 4616.5855347865. The cubic root of 21312862 is about 277.2557686630.

The spelling of 21312862 in words is "twenty-one million, three hundred twelve thousand, eight hundred sixty-two".