21195532408 has 32 divisors (see below), whose sum is σ = 42792591600. Its totient is φ = 9805307392.

The previous prime is 21195532363. The next prime is 21195532411. The reversal of 21195532408 is 80423559112.

It is a happy number.

It is a congruent number.

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, 1312735 + ... + 1328782.

Almost surely, 2^21195532408 is an apocalyptic number.

It is an amenable number.

21195532408 is an abundant number, since it is smaller than the sum of its proper divisors (21597059192).

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

21195532408 is a wasteful number, since it uses less digits than its factorization.

21195532408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2641599 (or 2641595 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 21195532408 in words is "twenty-one billion, one hundred ninety-five million, five hundred thirty-two thousand, four hundred eight".