111220221121 has 2 divisors, whose sum is σ = 111220221122. Its totient is φ = 111220221120.

The previous prime is 111220221107. The next prime is 111220221127. The reversal of 111220221121 is 121122022111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97163747521 + 14056473600 = 311711^2 + 118560^2 .

It is a cyclic number.

It is not a de Polignac number, because 111220221121 - 2¹⁷ = 111220090049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111220221095 and 111220221104.

It is not a weakly prime, because it can be changed into another prime (111220221127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610110560 + 55610110561.

It is an arithmetic number, because the mean of its divisors is an integer number (55610110561).

Almost surely, 2^111220221121 is an apocalyptic number.

It is an amenable number.

111220221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111220221121 is an equidigital number, since it uses as much as digits as its factorization.

111220221121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111220221121 its reverse (121122022111), we get a palindrome (232342243232).

The spelling of 111220221121 in words is "one hundred eleven billion, two hundred twenty million, two hundred twenty-one thousand, one hundred twenty-one".