21943595472 has 40 divisors (see below), whose sum is σ = 56751930144. Its totient is φ = 7306233984.

The previous prime is 21943595437. The next prime is 21943595477. The reversal of 21943595472 is 27459534912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21943595477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216483 + ... + 301250.

Almost surely, 2^21943595472 is an apocalyptic number.

It is an amenable number.

21943595472 is an abundant number, since it is smaller than the sum of its proper divisors (34808334672).

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

21943595472 is a wasteful number, since it uses less digits than its factorization.

21943595472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518627 (or 518621 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 51.

The spelling of 21943595472 in words is "twenty-one billion, nine hundred forty-three million, five hundred ninety-five thousand, four hundred seventy-two".