21719903232 has 66 divisors (see below), whose sum is σ = 57913240908. Its totient is φ = 7237244928.

The previous prime is 21719903221. The next prime is 21719903279. The reversal of 21719903232 is 23230991712.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8167119 + ... + 8169777.

Almost surely, 2^21719903232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21719903232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28956620454).

21719903232 is an abundant number, since it is smaller than the sum of its proper divisors (36193337676).

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

21719903232 is an frugal number, since it uses more digits than its factorization.

21719903232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5341 (or 2664 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 39.

The spelling of 21719903232 in words is "twenty-one billion, seven hundred nineteen million, nine hundred three thousand, two hundred thirty-two".