13864315221 has 6 divisors (see below), whose sum is σ = 20026233110. Its totient is φ = 9242876808.

The previous prime is 13864315183. The next prime is 13864315229. The reversal of 13864315221 is 12251346831.

13864315221 is a `hidden beast` number, since 1 + 3 + 8 + 643 + 1 + 5 + 2 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12345654321 + 1518660900 = 111111^2 + 38970^2 .

It is not a de Polignac number, because 13864315221 - 2⁷ = 13864315093 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 (13864315229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 770239726 + ... + 770239743.

Almost surely, 2^13864315221 is an apocalyptic number.

It is an amenable number.

13864315221 is a deficient number, since it is larger than the sum of its proper divisors (6161917889).

13864315221 is a wasteful number, since it uses less digits than its factorization.

13864315221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540479475 (or 1540479472 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The spelling of 13864315221 in words is "thirteen billion, eight hundred sixty-four million, three hundred fifteen thousand, two hundred twenty-one".