111110221121 has 2 divisors, whose sum is σ = 111110221122. Its totient is φ = 111110221120.

The previous prime is 111110221073. The next prime is 111110221127. The reversal of 111110221121 is 121122011111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84308929600 + 26801291521 = 290360^2 + 163711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111110221121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111110221096 and 111110221105.

It is not a weakly prime, because it can be changed into another prime (111110221127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555110560 + 55555110561.

It is an arithmetic number, because the mean of its divisors is an integer number (55555110561).

Almost surely, 2^111110221121 is an apocalyptic number.

It is an amenable number.

111110221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111110221121 is an equidigital number, since it uses as much as digits as its factorization.

111110221121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 111110221121 its reverse (121122011111), we get a palindrome (232232232232).

The spelling of 111110221121 in words is "one hundred eleven billion, one hundred ten million, two hundred twenty-one thousand, one hundred twenty-one".