12122111993 has 2 divisors, whose sum is σ = 12122111994. Its totient is φ = 12122111992.

The previous prime is 12122111977. The next prime is 12122112031. The reversal of 12122111993 is 39911122121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12099340009 + 22771984 = 109997^2 + 4772^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122111993 - 2⁴ = 12122111977 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12122111893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061055996 + 6061055997.

It is an arithmetic number, because the mean of its divisors is an integer number (6061055997).

Almost surely, 2^12122111993 is an apocalyptic number.

It is an amenable number.

12122111993 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122111993 is an equidigital number, since it uses as much as digits as its factorization.

12122111993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 32.

The spelling of 12122111993 in words is "twelve billion, one hundred twenty-two million, one hundred eleven thousand, nine hundred ninety-three".