13125332221 has 12 divisors (see below), whose sum is σ = 13857541500. Its totient is φ = 12429998208.

The previous prime is 13125332219. The next prime is 13125332243. The reversal of 13125332221 is 12223352131.

It can be written as a sum of positive squares in 2 ways, for example, as 10503380196 + 2621952025 = 102486^2 + 51205^2 .

It is not a de Polignac number, because 13125332221 - 2¹ = 13125332219 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 (13125332201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1399255 + ... + 1408603.

It is an arithmetic number, because the mean of its divisors is an integer number (1154795125).

Almost surely, 2^13125332221 is an apocalyptic number.

It is an amenable number.

13125332221 is a deficient number, since it is larger than the sum of its proper divisors (732209279).

13125332221 is an equidigital number, since it uses as much as digits as its factorization.

13125332221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13276 (or 13257 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

Adding to 13125332221 its reverse (12223352131), we get a palindrome (25348684352).

The spelling of 13125332221 in words is "thirteen billion, one hundred twenty-five million, three hundred thirty-two thousand, two hundred twenty-one".