21160525613 has 4 divisors (see below), whose sum is σ = 21890198940. Its totient is φ = 20430852288.

The previous prime is 21160525579. The next prime is 21160525627. The reversal of 21160525613 is 31652506112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14386083364 + 6774442249 = 119942^2 + 82307^2 .

It is a cyclic number.

It is not a de Polignac number, because 21160525613 - 2¹⁸ = 21160263469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21160525613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21160525213) 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, 364836620 + ... + 364836677.

It is an arithmetic number, because the mean of its divisors is an integer number (5472549735).

Almost surely, 2^21160525613 is an apocalyptic number.

It is an amenable number.

21160525613 is a deficient number, since it is larger than the sum of its proper divisors (729673327).

21160525613 is an equidigital number, since it uses as much as digits as its factorization.

21160525613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729673326.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 21160525613 in words is "twenty-one billion, one hundred sixty million, five hundred twenty-five thousand, six hundred thirteen".