21859672 has 16 divisors (see below), whose sum is σ = 41371560. Its totient is φ = 10827264.

The previous prime is 21859661. The next prime is 21859679. The reversal of 21859672 is 27695812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21859679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11913 + ... + 13624.

Almost surely, 2^21859672 is an apocalyptic number.

It is an amenable number.

21859672 is a deficient number, since it is larger than the sum of its proper divisors (19511888).

21859672 is a wasteful number, since it uses less digits than its factorization.

21859672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25650 (or 25646 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 21859672 is about 4675.4328141895. The cubic root of 21859672 is about 279.6068973461.

The spelling of 21859672 in words is "twenty-one million, eight hundred fifty-nine thousand, six hundred seventy-two".