13872525221 has 2 divisors, whose sum is σ = 13872525222. Its totient is φ = 13872525220.

The previous prime is 13872525197. The next prime is 13872525223. The reversal of 13872525221 is 12252527831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13676133025 + 196392196 = 116945^2 + 14014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13872525221 is a prime.

Together with 13872525223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13872525223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6936262610 + 6936262611.

It is an arithmetic number, because the mean of its divisors is an integer number (6936262611).

Almost surely, 2^13872525221 is an apocalyptic number.

It is an amenable number.

13872525221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13872525221 is an equidigital number, since it uses as much as digits as its factorization.

13872525221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67200, while the sum is 38.

The spelling of 13872525221 in words is "thirteen billion, eight hundred seventy-two million, five hundred twenty-five thousand, two hundred twenty-one".