13696628221 has 8 divisors (see below), whose sum is σ = 14512052664. Its totient is φ = 12882286080.

The previous prime is 13696628213. The next prime is 13696628261. The reversal of 13696628221 is 12282669631.

It can be written as a sum of positive squares in 4 ways, for example, as 7294868100 + 6401760121 = 85410^2 + 80011^2 .

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 13696628221 - 2³ = 13696628213 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 (13696628261) 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, 244440 + ... + 295201.

It is an arithmetic number, because the mean of its divisors is an integer number (1814006583).

Almost surely, 2^13696628221 is an apocalyptic number.

It is an amenable number.

13696628221 is a deficient number, since it is larger than the sum of its proper divisors (815424443).

13696628221 is a wasteful number, since it uses less digits than its factorization.

13696628221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541151.

The product of its digits is 373248, while the sum is 46.

The spelling of 13696628221 in words is "thirteen billion, six hundred ninety-six million, six hundred twenty-eight thousand, two hundred twenty-one".