12001223212131 has 4 divisors (see below), whose sum is σ = 16001630949512. Its totient is φ = 8000815474752.

The previous prime is 12001223212123. The next prime is 12001223212151. The reversal of 12001223212131 is 13121232210021.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12001223212131 - 2³ = 12001223212123 is a prime.

It is a super-2 number, since 2×12001223212131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001223212098 and 12001223212107.

It is not an unprimeable number, because it can be changed into a prime (12001223212151) 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, 2000203868686 + ... + 2000203868691.

It is an arithmetic number, because the mean of its divisors is an integer number (4000407737378).

Almost surely, 2^{12001223212131} is an apocalyptic number.

12001223212131 is a deficient number, since it is larger than the sum of its proper divisors (4000407737381).

12001223212131 is an equidigital number, since it uses as much as digits as its factorization.

12001223212131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4000407737380.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 12001223212131 its reverse (13121232210021), we get a palindrome (25122455422152).

The spelling of 12001223212131 in words is "twelve trillion, one billion, two hundred twenty-three million, two hundred twelve thousand, one hundred thirty-one".