21574764960 has 384 divisors, whose sum is σ = 82056167424. Its totient is φ = 4660346880.

The previous prime is 21574764949. The next prime is 21574764983. The reversal of 21574764960 is 6946747512.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4476472 + ... + 4481288.

It is an arithmetic number, because the mean of its divisors is an integer number (213687936).

Almost surely, 2^21574764960 is an apocalyptic number.

21574764960 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 21574764960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41028083712).

21574764960 is an abundant number, since it is smaller than the sum of its proper divisors (60481402464).

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

21574764960 is a wasteful number, since it uses less digits than its factorization.

21574764960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4916 (or 4908 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 51.

The spelling of 21574764960 in words is "twenty-one billion, five hundred seventy-four million, seven hundred sixty-four thousand, nine hundred sixty".