12042042109 has 2 divisors, whose sum is σ = 12042042110. Its totient is φ = 12042042108.

The previous prime is 12042042071. The next prime is 12042042119. The reversal of 12042042109 is 90124024021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11680205625 + 361836484 = 108075^2 + 19022^2 .

It is a cyclic number.

It is not a de Polignac number, because 12042042109 - 2¹⁵ = 12042009341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12042042119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6021021054 + 6021021055.

It is an arithmetic number, because the mean of its divisors is an integer number (6021021055).

Almost surely, 2^12042042109 is an apocalyptic number.

It is an amenable number.

12042042109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12042042109 is an equidigital number, since it uses as much as digits as its factorization.

12042042109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 12042042109 in words is "twelve billion, forty-two million, forty-two thousand, one hundred nine".