21746812 has 12 divisors (see below), whose sum is σ = 38089576. Its totient is φ = 10864080.

The previous prime is 21746807. The next prime is 21746821. The reversal of 21746812 is 21864712.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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, 7987 + ... + 10357.

Almost surely, 2^21746812 is an apocalyptic number.

It is an amenable number.

21746812 is a deficient number, since it is larger than the sum of its proper divisors (16342764).

21746812 is a wasteful number, since it uses less digits than its factorization.

21746812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4668 (or 4666 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 21746812 is about 4663.3477245430. The cubic root of 21746812 is about 279.1248697010.

The spelling of 21746812 in words is "twenty-one million, seven hundred forty-six thousand, eight hundred twelve".