21231596 has 24 divisors (see below), whose sum is σ = 38831520. Its totient is φ = 10144512.

The previous prime is 21231583. The next prime is 21231601. The reversal of 21231596 is 69513212.

It is a Harshad number since it is a multiple of its sum of digits (29).

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, 11060 + ... + 12836.

It is an arithmetic number, because the mean of its divisors is an integer number (1617980).

Almost surely, 2^21231596 is an apocalyptic number.

It is an amenable number.

21231596 is a deficient number, since it is larger than the sum of its proper divisors (17599924).

21231596 is a wasteful number, since it uses less digits than its factorization.

21231596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913 (or 1911 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 21231596 is about 4607.7756021751. The cubic root of 21231596 is about 276.9029274909.

The spelling of 21231596 in words is "twenty-one million, two hundred thirty-one thousand, five hundred ninety-six".