21979590480 has 60 divisors (see below), whose sum is σ = 73814793780. Its totient is φ = 5861223936.

The previous prime is 21979590443. The next prime is 21979590509. The reversal of 21979590480 is 8409597912.

21979590480 is a `hidden beast` number, since 2 + 1 + 9 + 7 + 9 + 590 + 48 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2381830416 + 19597760064 = 48804^2 + 139992^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15262885 + ... + 15264324.

It is an arithmetic number, because the mean of its divisors is an integer number (1230246563).

Almost surely, 2^21979590480 is an apocalyptic number.

21979590480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21979590480 is an abundant number, since it is smaller than the sum of its proper divisors (51835203300).

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

21979590480 is a wasteful number, since it uses less digits than its factorization.

21979590480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30527228 (or 30527219 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 21979590480 in words is "twenty-one billion, nine hundred seventy-nine million, five hundred ninety thousand, four hundred eighty".