13727311621 has 4 divisors (see below), whose sum is σ = 13739872012. Its totient is φ = 13714751232.

The previous prime is 13727311601. The next prime is 13727311643. The reversal of 13727311621 is 12611372731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12611372731 = 21569 ⋅584699.

It can be written as a sum of positive squares in 2 ways, for example, as 10755971521 + 2971340100 = 103711^2 + 54510^2 .

It is a cyclic number.

It is not a de Polignac number, because 13727311621 - 2²⁷ = 13593093893 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 (13727311601) 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, 6278556 + ... + 6280741.

It is an arithmetic number, because the mean of its divisors is an integer number (3434968003).

Almost surely, 2^13727311621 is an apocalyptic number.

It is an amenable number.

13727311621 is a deficient number, since it is larger than the sum of its proper divisors (12560391).

13727311621 is a wasteful number, since it uses less digits than its factorization.

13727311621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12560390.

The product of its digits is 10584, while the sum is 34.

The spelling of 13727311621 in words is "thirteen billion, seven hundred twenty-seven million, three hundred eleven thousand, six hundred twenty-one".