21172480722 has 48 divisors (see below), whose sum is σ = 46424214720. Its totient is φ = 6973092000.

The previous prime is 21172480687. The next prime is 21172480723. The reversal of 21172480722 is 22708427112.

21172480722 is a `hidden beast` number, since 2 + 1 + 172 + 480 + 7 + 2 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (21172480723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 880779 + ... + 904497.

It is an arithmetic number, because the mean of its divisors is an integer number (967171140).

Almost surely, 2^21172480722 is an apocalyptic number.

21172480722 is an abundant number, since it is smaller than the sum of its proper divisors (25251733998).

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

21172480722 is a wasteful number, since it uses less digits than its factorization.

21172480722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24319 (or 24316 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The spelling of 21172480722 in words is "twenty-one billion, one hundred seventy-two million, four hundred eighty thousand, seven hundred twenty-two".