13531221113 has 2 divisors, whose sum is σ = 13531221114. Its totient is φ = 13531221112.

The previous prime is 13531221107. The next prime is 13531221131. The reversal of 13531221113 is 31112213531.

Together with next prime (13531221131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6877882489 + 6653338624 = 82933^2 + 81568^2 .

It is a cyclic number.

It is not a de Polignac number, because 13531221113 - 2³⁰ = 12457479289 is a prime.

It is not a weakly prime, because it can be changed into another prime (13531223113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765610556 + 6765610557.

It is an arithmetic number, because the mean of its divisors is an integer number (6765610557).

Almost surely, 2^13531221113 is an apocalyptic number.

It is an amenable number.

13531221113 is a deficient number, since it is larger than the sum of its proper divisors (1).

13531221113 is an equidigital number, since it uses as much as digits as its factorization.

13531221113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 23.

Adding to 13531221113 its reverse (31112213531), we get a palindrome (44643434644).

The spelling of 13531221113 in words is "thirteen billion, five hundred thirty-one million, two hundred twenty-one thousand, one hundred thirteen".