21712892 has 12 divisors (see below), whose sum is σ = 38133816. Its totient is φ = 10817520.

The previous prime is 21712871. The next prime is 21712907. The reversal of 21712892 is 29821712.

It is a happy number.

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, 8459 + ... + 10722.

It is an arithmetic number, because the mean of its divisors is an integer number (3177818).

Almost surely, 2^21712892 is an apocalyptic number.

It is an amenable number.

21712892 is a deficient number, since it is larger than the sum of its proper divisors (16420924).

21712892 is a wasteful number, since it uses less digits than its factorization.

21712892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19468 (or 19466 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 21712892 is about 4659.7094330012. The cubic root of 21712892 is about 278.9796707566.

The spelling of 21712892 in words is "twenty-one million, seven hundred twelve thousand, eight hundred ninety-two".