12121199999 has 2 divisors, whose sum is σ = 12121200000. Its totient is φ = 12121199998.

The previous prime is 12121199989. The next prime is 12121200023. The reversal of 12121199999 is 99999112121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12121199999 - 2²⁸ = 11852764543 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12121199999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121199989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060599999 + 6060600000.

It is an arithmetic number, because the mean of its divisors is an integer number (6060600000).

Almost surely, 2^12121199999 is an apocalyptic number.

12121199999 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121199999 is an equidigital number, since it uses as much as digits as its factorization.

12121199999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 236196, while the sum is 53.

The spelling of 12121199999 in words is "twelve billion, one hundred twenty-one million, one hundred ninety-nine thousand, nine hundred ninety-nine".