21597701484 has 12 divisors (see below), whose sum is σ = 50394636824. Its totient is φ = 7199233824.

The previous prime is 21597701479. The next prime is 21597701491. The reversal of 21597701484 is 48410779512.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 899904217 + ... + 899904240.

Almost surely, 2^21597701484 is an apocalyptic number.

It is an amenable number.

21597701484 is an abundant number, since it is smaller than the sum of its proper divisors (28796935340).

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

21597701484 is a wasteful number, since it uses less digits than its factorization.

21597701484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799808464 (or 1799808462 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 48.

The spelling of 21597701484 in words is "twenty-one billion, five hundred ninety-seven million, seven hundred one thousand, four hundred eighty-four".