113131123421 has 2 divisors, whose sum is σ = 113131123422. Its totient is φ = 113131123420.

The previous prime is 113131123397. The next prime is 113131123429. The reversal of 113131123421 is 124321131311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111498559396 + 1632564025 = 333914^2 + 40405^2 .

It is a cyclic number.

It is not a de Polignac number, because 113131123421 - 2¹⁰ = 113131122397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113131123429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56565561710 + 56565561711.

It is an arithmetic number, because the mean of its divisors is an integer number (56565561711).

Almost surely, 2^113131123421 is an apocalyptic number.

It is an amenable number.

113131123421 is a deficient number, since it is larger than the sum of its proper divisors (1).

113131123421 is an equidigital number, since it uses as much as digits as its factorization.

113131123421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

Adding to 113131123421 its reverse (124321131311), we get a palindrome (237452254732).

The spelling of 113131123421 in words is "one hundred thirteen billion, one hundred thirty-one million, one hundred twenty-three thousand, four hundred twenty-one".