113231013221 has 2 divisors, whose sum is σ = 113231013222. Its totient is φ = 113231013220.

The previous prime is 113231013179. The next prime is 113231013223. The reversal of 113231013221 is 122310132311.

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., 75550768225 + 37680244996 = 274865^2 + 194114^2 .

It is a cyclic number.

It is not a de Polignac number, because 113231013221 - 2¹⁸ = 113230751077 is a prime.

It is a Sophie Germain prime.

Together with 113231013223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 113231013193 and 113231013202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113231013223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56615506610 + 56615506611.

It is an arithmetic number, because the mean of its divisors is an integer number (56615506611).

Almost surely, 2^113231013221 is an apocalyptic number.

It is an amenable number.

113231013221 is a deficient number, since it is larger than the sum of its proper divisors (1).

113231013221 is an equidigital number, since it uses as much as digits as its factorization.

113231013221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 113231013221 its reverse (122310132311), we get a palindrome (235541145532).

The spelling of 113231013221 in words is "one hundred thirteen billion, two hundred thirty-one million, thirteen thousand, two hundred twenty-one".