21874200591 has 24 divisors (see below), whose sum is σ = 30227950480. Its totient is φ = 14069712384.

The previous prime is 21874200589. The next prime is 21874200613. The reversal of 21874200591 is 19500247812.

It is not a de Polignac number, because 21874200591 - 2¹ = 21874200589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21874200571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5117031 + ... + 5121303.

Almost surely, 2^21874200591 is an apocalyptic number.

21874200591 is a deficient number, since it is larger than the sum of its proper divisors (8353749889).

21874200591 is a wasteful number, since it uses less digits than its factorization.

21874200591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6363 (or 6334 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 21874200591 in words is "twenty-one billion, eight hundred seventy-four million, two hundred thousand, five hundred ninety-one".