21997042596 has 81 divisors (see below), whose sum is σ = 58729310913. Its totient is φ = 6941095200.

The previous prime is 21997042591. The next prime is 21997042597. The reversal of 21997042596 is 69524079912.

The square root of 21997042596 is 148314.

It is a perfect power (a square), and thus also a powerful number.

21997042596 is a `hidden beast` number, since 2 + 1 + 9 + 9 + 7 + 0 + 42 + 596 = 666.

It can be written as a sum of positive squares in only one way, i.e., 33802596 + 21963240000 = 5814^2 + 148200^2 .

It is not an unprimeable number, because it can be changed into a prime (21997042591) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 16907146 + ... + 16908446.

Almost surely, 2^21997042596 is an apocalyptic number.

21997042596 is the 148314-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21997042596

21997042596 is an abundant number, since it is smaller than the sum of its proper divisors (36732268317).

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

21997042596 is a wasteful number, since it uses less digits than its factorization.

21997042596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650 (or 1325 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 21997042596 in words is "twenty-one billion, nine hundred ninety-seven million, forty-two thousand, five hundred ninety-six".