111310331221 has 2 divisors, whose sum is σ = 111310331222. Its totient is φ = 111310331220.

The previous prime is 111310331159. The next prime is 111310331243. The reversal of 111310331221 is 122133013111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61002084196 + 50308247025 = 246986^2 + 224295^2 .

It is a cyclic number.

It is not a de Polignac number, because 111310331221 - 2¹⁵ = 111310298453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111310331281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55655165610 + 55655165611.

It is an arithmetic number, because the mean of its divisors is an integer number (55655165611).

Almost surely, 2^111310331221 is an apocalyptic number.

It is an amenable number.

111310331221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111310331221 is an equidigital number, since it uses as much as digits as its factorization.

111310331221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 111310331221 its reverse (122133013111), we get a palindrome (233443344332).

The spelling of 111310331221 in words is "one hundred eleven billion, three hundred ten million, three hundred thirty-one thousand, two hundred twenty-one".