111101011122221 has 2 divisors, whose sum is σ = 111101011122222. Its totient is φ = 111101011122220.

The previous prime is 111101011122169. The next prime is 111101011122271. The reversal of 111101011122221 is 122221110101111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111050392422025 + 50618700196 = 10538045^2 + 224986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111101011122221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111101011122221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111101011122271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550505561110 + 55550505561111.

It is an arithmetic number, because the mean of its divisors is an integer number (55550505561111).

Almost surely, 2^{111101011122221} is an apocalyptic number.

It is an amenable number.

111101011122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111101011122221 is an equidigital number, since it uses as much as digits as its factorization.

111101011122221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 111101011122221 its reverse (122221110101111), we get a palindrome (233322121223332).

The spelling of 111101011122221 in words is "one hundred eleven trillion, one hundred one billion, eleven million, one hundred twenty-two thousand, two hundred twenty-one".