21589896 has 32 divisors (see below), whose sum is σ = 54718560. Its totient is φ = 7097472.

The previous prime is 21589859. The next prime is 21589937. The reversal of 21589896 is 69898512.

It is a happy number.

It is a super-2 number, since 2×21589896² = 932247218581632, which contains 22 as substring.

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, 4410 + ... + 7913.

It is an arithmetic number, because the mean of its divisors is an integer number (1709955).

Almost surely, 2^21589896 is an apocalyptic number.

It is an amenable number.

21589896 is an abundant number, since it is smaller than the sum of its proper divisors (33128664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21589896 is a wasteful number, since it uses less digits than its factorization.

21589896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12405 (or 12401 counting only the distinct ones).

The product of its digits is 311040, while the sum is 48.

The square root of 21589896 is about 4646.4928709727. The cubic root of 21589896 is about 278.4518986018.

The spelling of 21589896 in words is "twenty-one million, five hundred eighty-nine thousand, eight hundred ninety-six".