111212210221129 has 2 divisors, whose sum is σ = 111212210221130. Its totient is φ = 111212210221128.

The previous prime is 111212210221019. The next prime is 111212210221193. The reversal of 111212210221129 is 921122012212111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62530960153104 + 48681250068025 = 7907652^2 + 6977195^2 .

It is a cyclic number.

It is not a de Polignac number, because 111212210221129 - 2¹⁷ = 111212210090057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111212210221097 and 111212210221106.

It is not a weakly prime, because it can be changed into another prime (111212210221729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606105110564 + 55606105110565.

It is an arithmetic number, because the mean of its divisors is an integer number (55606105110565).

Almost surely, 2^{111212210221129} is an apocalyptic number.

It is an amenable number.

111212210221129 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212210221129 is an equidigital number, since it uses as much as digits as its factorization.

111212210221129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 28.

The spelling of 111212210221129 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred ten million, two hundred twenty-one thousand, one hundred twenty-nine".