21759116939 has 12 divisors (see below), whose sum is σ = 26643817800. Its totient is φ = 17669056608.

The previous prime is 21759116909. The next prime is 21759116957. The reversal of 21759116939 is 93961195712.

It is a de Polignac number, because none of the positive numbers 2^k-21759116939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21759116909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11684954 + ... + 11686815.

It is an arithmetic number, because the mean of its divisors is an integer number (2220318150).

Almost surely, 2^21759116939 is an apocalyptic number.

21759116939 is a deficient number, since it is larger than the sum of its proper divisors (4884700861).

21759116939 is a wasteful number, since it uses less digits than its factorization.

21759116939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23371802 (or 23371795 counting only the distinct ones).

The product of its digits is 918540, while the sum is 53.

The spelling of 21759116939 in words is "twenty-one billion, seven hundred fifty-nine million, one hundred sixteen thousand, nine hundred thirty-nine".