21971422499 has 4 divisors (see below), whose sum is σ = 23661531936. Its totient is φ = 20281313064.

The previous prime is 21971422457. The next prime is 21971422513. The reversal of 21971422499 is 99422417912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21971422499 - 2²⁰ = 21970373923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21971452499) 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 3 ways as a sum of consecutive naturals, for example, 845054699 + ... + 845054724.

It is an arithmetic number, because the mean of its divisors is an integer number (5915382984).

Almost surely, 2^21971422499 is an apocalyptic number.

21971422499 is a deficient number, since it is larger than the sum of its proper divisors (1690109437).

21971422499 is a wasteful number, since it uses less digits than its factorization.

21971422499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690109436.

The product of its digits is 653184, while the sum is 50.

The spelling of 21971422499 in words is "twenty-one billion, nine hundred seventy-one million, four hundred twenty-two thousand, four hundred ninety-nine".