113221311221 has 2 divisors, whose sum is σ = 113221311222. Its totient is φ = 113221311220.

The previous prime is 113221311179. The next prime is 113221311233. The reversal of 113221311221 is 122113122311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89019286321 + 24202024900 = 298361^2 + 155570^2 .

It is a cyclic number.

It is not a de Polignac number, because 113221311221 - 2³⁰ = 112147569397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 113221311193 and 113221311202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113221311271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56610655610 + 56610655611.

It is an arithmetic number, because the mean of its divisors is an integer number (56610655611).

Almost surely, 2^113221311221 is an apocalyptic number.

It is an amenable number.

113221311221 is a deficient number, since it is larger than the sum of its proper divisors (1).

113221311221 is an equidigital number, since it uses as much as digits as its factorization.

113221311221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 20.

Adding to 113221311221 its reverse (122113122311), we get a palindrome (235334433532).

The spelling of 113221311221 in words is "one hundred thirteen billion, two hundred twenty-one million, three hundred eleven thousand, two hundred twenty-one".