21859532 has 24 divisors (see below), whose sum is σ = 39414816. Its totient is φ = 10603008.

The previous prime is 21859529. The next prime is 21859543. The reversal of 21859532 is 23595812.

It is a junction number, because it is equal to n+sod(n) for n = 21859492 and 21859501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20033 + ... + 21095.

It is an arithmetic number, because the mean of its divisors is an integer number (1642284).

Almost surely, 2^21859532 is an apocalyptic number.

It is an amenable number.

21859532 is a deficient number, since it is larger than the sum of its proper divisors (17555284).

21859532 is a wasteful number, since it uses less digits than its factorization.

21859532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217 (or 1215 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 21859532 is about 4675.4178422896. The cubic root of 21859532 is about 279.6063004318.

The spelling of 21859532 in words is "twenty-one million, eight hundred fifty-nine thousand, five hundred thirty-two".