123211111109 has 2 divisors, whose sum is σ = 123211111110. Its totient is φ = 123211111108.

The previous prime is 123211111097. The next prime is 123211111129. The reversal of 123211111109 is 901111112321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122115302500 + 1095808609 = 349450^2 + 33103^2 .

It is a cyclic number.

It is not a de Polignac number, because 123211111109 - 2²⁴ = 123194333893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123211111129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61605555554 + 61605555555.

It is an arithmetic number, because the mean of its divisors is an integer number (61605555555).

Almost surely, 2^123211111109 is an apocalyptic number.

It is an amenable number.

123211111109 is a deficient number, since it is larger than the sum of its proper divisors (1).

123211111109 is an equidigital number, since it uses as much as digits as its factorization.

123211111109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 23.

The spelling of 123211111109 in words is "one hundred twenty-three billion, two hundred eleven million, one hundred eleven thousand, one hundred nine".