21061596 has 12 divisors (see below), whose sum is σ = 49143752. Its totient is φ = 7020528.

The previous prime is 21061591. The next prime is 21061603. The reversal of 21061596 is 69516012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21061591) 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, 877555 + ... + 877578.

Almost surely, 2^21061596 is an apocalyptic number.

It is an amenable number.

21061596 is an abundant number, since it is smaller than the sum of its proper divisors (28082156).

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

21061596 is a wasteful number, since it uses less digits than its factorization.

21061596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755140 (or 1755138 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 21061596 is about 4589.2914485790. The cubic root of 21061596 is about 276.1618982926.

The spelling of 21061596 in words is "twenty-one million, sixty-one thousand, five hundred ninety-six".