12123121187 has 2 divisors, whose sum is σ = 12123121188. Its totient is φ = 12123121186.

The previous prime is 12123121163. The next prime is 12123121201. The reversal of 12123121187 is 78112132121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12123121187 - 2¹² = 12123117091 is a prime.

It is not a weakly prime, because it can be changed into another prime (12123121487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061560593 + 6061560594.

It is an arithmetic number, because the mean of its divisors is an integer number (6061560594).

Almost surely, 2^12123121187 is an apocalyptic number.

12123121187 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123121187 is an equidigital number, since it uses as much as digits as its factorization.

12123121187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 29.

The spelling of 12123121187 in words is "twelve billion, one hundred twenty-three million, one hundred twenty-one thousand, one hundred eighty-seven".