12122001993 has 4 divisors (see below), whose sum is σ = 16162669328. Its totient is φ = 8081334660.

The previous prime is 12122001979. The next prime is 12122002019. The reversal of 12122001993 is 39910022121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39910022121 = 3 ⋅13303340707.

It is not a de Polignac number, because 12122001993 - 2⁵ = 12122001961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12122001993.

It is not an unprimeable number, because it can be changed into a prime (12122001953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2020333663 + ... + 2020333668.

It is an arithmetic number, because the mean of its divisors is an integer number (4040667332).

Almost surely, 2^12122001993 is an apocalyptic number.

It is an amenable number.

12122001993 is a deficient number, since it is larger than the sum of its proper divisors (4040667335).

12122001993 is an equidigital number, since it uses as much as digits as its factorization.

12122001993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040667334.

The product of its (nonzero) digits is 1944, while the sum is 30.

The spelling of 12122001993 in words is "twelve billion, one hundred twenty-two million, one thousand, nine hundred ninety-three".