111021122221211 has 2 divisors, whose sum is σ = 111021122221212. Its totient is φ = 111021122221210.

The previous prime is 111021122221073. The next prime is 111021122221271. The reversal of 111021122221211 is 112122221120111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111021122221211 - 2³⁰ = 111020048479387 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (111021122221271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510561110605 + 55510561110606.

It is an arithmetic number, because the mean of its divisors is an integer number (55510561110606).

Almost surely, 2^{111021122221211} is an apocalyptic number.

111021122221211 is a deficient number, since it is larger than the sum of its proper divisors (1).

111021122221211 is an equidigital number, since it uses as much as digits as its factorization.

111021122221211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111021122221211 its reverse (112122221120111), we get a palindrome (223143343341322).

The spelling of 111021122221211 in words is "one hundred eleven trillion, twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred eleven".