21597934080 has 320 divisors, whose sum is σ = 71473425408. Its totient is φ = 5560074240.

The previous prime is 21597934027. The next prime is 21597934097. The reversal of 21597934080 is 8043979512.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35581137 + ... + 35581743.

Almost surely, 2^21597934080 is an apocalyptic number.

21597934080 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 21597934080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35736712704).

21597934080 is an abundant number, since it is smaller than the sum of its proper divisors (49875491328).

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

21597934080 is a wasteful number, since it uses less digits than its factorization.

21597934080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787 (or 771 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 21597934080 in words is "twenty-one billion, five hundred ninety-seven million, nine hundred thirty-four thousand, eighty".