13967877221 has 2 divisors, whose sum is σ = 13967877222. Its totient is φ = 13967877220.

The previous prime is 13967877181. The next prime is 13967877257. The reversal of 13967877221 is 12277876931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13920460225 + 47416996 = 117985^2 + 6886^2 .

It is a cyclic number.

It is not a de Polignac number, because 13967877221 - 2²² = 13963682917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13967870221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6983938610 + 6983938611.

It is an arithmetic number, because the mean of its divisors is an integer number (6983938611).

Almost surely, 2^13967877221 is an apocalyptic number.

It is an amenable number.

13967877221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13967877221 is an equidigital number, since it uses as much as digits as its factorization.

13967877221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 53.

The spelling of 13967877221 in words is "thirteen billion, nine hundred sixty-seven million, eight hundred seventy-seven thousand, two hundred twenty-one".