111102312221 has 2 divisors, whose sum is σ = 111102312222. Its totient is φ = 111102312220.

The previous prime is 111102312203. The next prime is 111102312253. The reversal of 111102312221 is 122213201111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110632072996 + 470239225 = 332614^2 + 21685^2 .

It is a cyclic number.

It is not a de Polignac number, because 111102312221 - 2¹⁸ = 111102050077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111102312221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111102512221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55551156110 + 55551156111.

It is an arithmetic number, because the mean of its divisors is an integer number (55551156111).

Almost surely, 2^111102312221 is an apocalyptic number.

It is an amenable number.

111102312221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111102312221 is an equidigital number, since it uses as much as digits as its factorization.

111102312221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 111102312221 its reverse (122213201111), we get a palindrome (233315513332).

The spelling of 111102312221 in words is "one hundred eleven billion, one hundred two million, three hundred twelve thousand, two hundred twenty-one".