21117117539 has 8 divisors (see below), whose sum is σ = 24145363200. Its totient is φ = 18091750536.

The previous prime is 21117117533. The next prime is 21117117563. The reversal of 21117117539 is 93571171112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21117117539 - 2⁸ = 21117117283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21117117533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 703919 + ... + 733304.

It is an arithmetic number, because the mean of its divisors is an integer number (3018170400).

Almost surely, 2^21117117539 is an apocalyptic number.

21117117539 is a deficient number, since it is larger than the sum of its proper divisors (3028245661).

21117117539 is a wasteful number, since it uses less digits than its factorization.

21117117539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439329.

The product of its digits is 13230, while the sum is 38.

The spelling of 21117117539 in words is "twenty-one billion, one hundred seventeen million, one hundred seventeen thousand, five hundred thirty-nine".