113213221212121 has 2 divisors, whose sum is σ = 113213221212122. Its totient is φ = 113213221212120.

The previous prime is 113213221212079. The next prime is 113213221212127. The reversal of 113213221212121 is 121212122312311.

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., 98197100208025 + 15016121004096 = 9909445^2 + 3875064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113213221212121 is a prime.

It is not a weakly prime, because it can be changed into another prime (113213221212127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56606610606060 + 56606610606061.

It is an arithmetic number, because the mean of its divisors is an integer number (56606610606061).

Almost surely, 2^{113213221212121} is an apocalyptic number.

It is an amenable number.

113213221212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

113213221212121 is an equidigital number, since it uses as much as digits as its factorization.

113213221212121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 25.

Adding to 113213221212121 its reverse (121212122312311), we get a palindrome (234425343524432).

The spelling of 113213221212121 in words is "one hundred thirteen trillion, two hundred thirteen billion, two hundred twenty-one million, two hundred twelve thousand, one hundred twenty-one".