13711645921 has 4 divisors (see below), whose sum is σ = 13712170644. Its totient is φ = 13711121200.

The previous prime is 13711645889. The next prime is 13711645951. The reversal of 13711645921 is 12954611731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12954611731 = 31 ⋅417890701.

It can be written as a sum of positive squares in 2 ways, for example, as 12491191696 + 1220454225 = 111764^2 + 34935^2 .

It is a cyclic number.

It is not a de Polignac number, because 13711645921 - 2⁵ = 13711645889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13711645951) 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, 220990 + ... + 276151.

It is an arithmetic number, because the mean of its divisors is an integer number (3428042661).

Almost surely, 2^13711645921 is an apocalyptic number.

It is an amenable number.

13711645921 is a deficient number, since it is larger than the sum of its proper divisors (524723).

13711645921 is an equidigital number, since it uses as much as digits as its factorization.

13711645921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524722.

The product of its digits is 45360, while the sum is 40.

The spelling of 13711645921 in words is "thirteen billion, seven hundred eleven million, six hundred forty-five thousand, nine hundred twenty-one".