12123121289 has 2 divisors, whose sum is σ = 12123121290. Its totient is φ = 12123121288.

The previous prime is 12123121201. The next prime is 12123121301. The reversal of 12123121289 is 98212132121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7311618064 + 4811503225 = 85508^2 + 69365^2 .

It is a cyclic number.

It is not a de Polignac number, because 12123121289 - 2⁸ = 12123121033 is a prime.

It is not a weakly prime, because it can be changed into another prime (12123111289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061560644 + 6061560645.

It is an arithmetic number, because the mean of its divisors is an integer number (6061560645).

Almost surely, 2^12123121289 is an apocalyptic number.

It is an amenable number.

12123121289 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123121289 is an equidigital number, since it uses as much as digits as its factorization.

12123121289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The spelling of 12123121289 in words is "twelve billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred eighty-nine".