21279992832 has 198 divisors, whose sum is σ = 71478955548. Its totient is φ = 6079868928.

The previous prime is 21279992821. The next prime is 21279992861. The reversal of 21279992832 is 23829997212.

21279992832 is a `hidden beast` number, since 2 + 1 + 279 + 99 + 283 + 2 = 666.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 428023 + ... + 475145.

It is an arithmetic number, because the mean of its divisors is an integer number (361004826).

Almost surely, 2^21279992832 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 21279992832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35739477774).

21279992832 is an abundant number, since it is smaller than the sum of its proper divisors (50198962716).

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

21279992832 is a wasteful number, since it uses less digits than its factorization.

21279992832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47163 (or 47135 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The spelling of 21279992832 in words is "twenty-one billion, two hundred seventy-nine million, nine hundred ninety-two thousand, eight hundred thirty-two".