113112221221 has 2 divisors, whose sum is σ = 113112221222. Its totient is φ = 113112221220.

The previous prime is 113112221177. The next prime is 113112221227. The reversal of 113112221221 is 122122211311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110948948100 + 2163273121 = 333090^2 + 46511^2 .

It is a cyclic number.

It is not a de Polignac number, because 113112221221 - 2⁹ = 113112220709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113112221227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56556110610 + 56556110611.

It is an arithmetic number, because the mean of its divisors is an integer number (56556110611).

Almost surely, 2^113112221221 is an apocalyptic number.

It is an amenable number.

113112221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

113112221221 is an equidigital number, since it uses as much as digits as its factorization.

113112221221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 19.

Adding to 113112221221 its reverse (122122211311), we get a palindrome (235234432532).

The spelling of 113112221221 in words is "one hundred thirteen billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".