113111221 has 2 divisors, whose sum is σ = 113111222. Its totient is φ = 113111220.

The previous prime is 113111203. The next prime is 113111227. The reversal of 113111221 is 122111311.

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., 107536900 + 5574321 = 10370^2 + 2361^2 .

It is a cyclic number.

It is not a de Polignac number, because 113111221 - 2⁵ = 113111189 is a prime.

It is a super-2 number, since 2×113111221² = 25588296632221682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113111227) 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, 56555610 + 56555611.

It is an arithmetic number, because the mean of its divisors is an integer number (56555611).

Almost surely, 2^113111221 is an apocalyptic number.

It is an amenable number.

113111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

113111221 is an equidigital number, since it uses as much as digits as its factorization.

113111221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12, while the sum is 13.

The square root of 113111221 is about 10635.3759218939. The cubic root of 113111221 is about 483.6173765484.

Adding to 113111221 its reverse (122111311), we get a palindrome (235222532).

The spelling of 113111221 in words is "one hundred thirteen million, one hundred eleven thousand, two hundred twenty-one".