113531523421 has 2 divisors, whose sum is σ = 113531523422. Its totient is φ = 113531523420.

The previous prime is 113531523407. The next prime is 113531523433. The reversal of 113531523421 is 124325135311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100497876196 + 13033647225 = 317014^2 + 114165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113531523421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113531523491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56765761710 + 56765761711.

It is an arithmetic number, because the mean of its divisors is an integer number (56765761711).

Almost surely, 2^113531523421 is an apocalyptic number.

It is an amenable number.

113531523421 is a deficient number, since it is larger than the sum of its proper divisors (1).

113531523421 is an equidigital number, since it uses as much as digits as its factorization.

113531523421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 31.

Adding to 113531523421 its reverse (124325135311), we get a palindrome (237856658732).

The spelling of 113531523421 in words is "one hundred thirteen billion, five hundred thirty-one million, five hundred twenty-three thousand, four hundred twenty-one".