111210121211209 has 2 divisors, whose sum is σ = 111210121211210. Its totient is φ = 111210121211208.

The previous prime is 111210121211131. The next prime is 111210121211243. The reversal of 111210121211209 is 902112121012111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96660260244025 + 14549860967184 = 9831595^2 + 3814428^2 .

It is a cyclic number.

It is not a de Polignac number, because 111210121211209 - 2²¹ = 111210119114057 is a prime.

It is not a weakly prime, because it can be changed into another prime (111210121215209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605060605604 + 55605060605605.

It is an arithmetic number, because the mean of its divisors is an integer number (55605060605605).

Almost surely, 2^{111210121211209} is an apocalyptic number.

It is an amenable number.

111210121211209 is a deficient number, since it is larger than the sum of its proper divisors (1).

111210121211209 is an equidigital number, since it uses as much as digits as its factorization.

111210121211209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 25.

The spelling of 111210121211209 in words is "one hundred eleven trillion, two hundred ten billion, one hundred twenty-one million, two hundred eleven thousand, two hundred nine".