21160722517 has 4 divisors (see below), whose sum is σ = 23084424576. Its totient is φ = 19237020460.

The previous prime is 21160722491. The next prime is 21160722547. The reversal of 21160722517 is 71522706112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21160722517 - 2¹⁵ = 21160689749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21160722547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 961851013 + ... + 961851034.

It is an arithmetic number, because the mean of its divisors is an integer number (5771106144).

Almost surely, 2^21160722517 is an apocalyptic number.

It is an amenable number.

21160722517 is a deficient number, since it is larger than the sum of its proper divisors (1923702059).

21160722517 is a wasteful number, since it uses less digits than its factorization.

21160722517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923702058.

The product of its (nonzero) digits is 11760, while the sum is 34.

The spelling of 21160722517 in words is "twenty-one billion, one hundred sixty million, seven hundred twenty-two thousand, five hundred seventeen".