21859312 has 20 divisors (see below), whose sum is σ = 42470496. Its totient is φ = 10899200.

The previous prime is 21859261. The next prime is 21859333. The reversal of 21859312 is 21395812.

It is a super-2 number, since 2×21859312² = 955659042226688, which contains 22 as substring.

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, 4713 + ... + 8119.

Almost surely, 2^21859312 is an apocalyptic number.

It is an amenable number.

21859312 is a deficient number, since it is larger than the sum of its proper divisors (20611184).

21859312 is a wasteful number, since it uses less digits than its factorization.

21859312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3816 (or 3810 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 21859312 is about 4675.3943149215. The cubic root of 21859312 is about 279.6053624186.

The spelling of 21859312 in words is "twenty-one million, eight hundred fifty-nine thousand, three hundred twelve".