21574072980 has 240 divisors, whose sum is σ = 68627978496. Its totient is φ = 5673058560.

The previous prime is 21574072969. The next prime is 21574072997. The reversal of 21574072980 is 8927047512.

It is a happy number.

21574072980 is a `hidden beast` number, since 2 + 1 + 574 + 0 + 72 + 9 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 58784757 + ... + 58785123.

Almost surely, 2^21574072980 is an apocalyptic number.

21574072980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21574072980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34313989248).

21574072980 is an abundant number, since it is smaller than the sum of its proper divisors (47053905516).

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

21574072980 is a wasteful number, since it uses less digits than its factorization.

21574072980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796 (or 785 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 21574072980 in words is "twenty-one billion, five hundred seventy-four million, seventy-two thousand, nine hundred eighty".