12211121999 has 2 divisors, whose sum is σ = 12211122000. Its totient is φ = 12211121998.

The previous prime is 12211121987. The next prime is 12211122013. The reversal of 12211121999 is 99912111221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12211121999 is a prime.

It is a super-2 number, since 2×12211121999² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12211121099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105560999 + 6105561000.

It is an arithmetic number, because the mean of its divisors is an integer number (6105561000).

Almost surely, 2^12211121999 is an apocalyptic number.

12211121999 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211121999 is an equidigital number, since it uses as much as digits as its factorization.

12211121999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 38.

The spelling of 12211121999 in words is "twelve billion, two hundred eleven million, one hundred twenty-one thousand, nine hundred ninety-nine".