221111122129 has 2 divisors, whose sum is σ = 221111122130. Its totient is φ = 221111122128.

The previous prime is 221111122103. The next prime is 221111122181. The reversal of 221111122129 is 921221111122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217480457104 + 3630665025 = 466348^2 + 60255^2 .

It is a cyclic number.

It is not a de Polignac number, because 221111122129 - 2⁵ = 221111122097 is a prime.

It is not a weakly prime, because it can be changed into another prime (221111122429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555561064 + 110555561065.

It is an arithmetic number, because the mean of its divisors is an integer number (110555561065).

Almost surely, 2^221111122129 is an apocalyptic number.

It is an amenable number.

221111122129 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111122129 is an equidigital number, since it uses as much as digits as its factorization.

221111122129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 25.

The spelling of 221111122129 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred twenty-two thousand, one hundred twenty-nine".