21862812 has 24 divisors (see below), whose sum is σ = 52659712. Its totient is φ = 7052400.

The previous prime is 21862801. The next prime is 21862823. The reversal of 21862812 is 21826812.

It is an interprime number because it is at equal distance from previous prime (21862801) and next prime (21862823).

It is a self number, because there is not a number n which added to its sum of digits gives 21862812.

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 7 ways as a sum of consecutive naturals, for example, 29014 + ... + 29757.

Almost surely, 2^21862812 is an apocalyptic number.

It is an amenable number.

21862812 is an abundant number, since it is smaller than the sum of its proper divisors (30796900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21862812 is a wasteful number, since it uses less digits than its factorization.

21862812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58809 (or 58807 counting only the distinct ones).

The product of its digits is 3072, while the sum is 30.

The square root of 21862812 is about 4675.7685999202. The cubic root of 21862812 is about 279.6202846104.

The spelling of 21862812 in words is "twenty-one million, eight hundred sixty-two thousand, eight hundred twelve".