12001213431 has 6 divisors (see below), whose sum is σ = 17335086080. Its totient is φ = 8000808948.

The previous prime is 12001213391. The next prime is 12001213453. The reversal of 12001213431 is 13431210021.

12001213431 is a `hidden beast` number, since 1 + 20 + 0 + 1 + 213 + 431 = 666.

It is not a de Polignac number, because 12001213431 - 2²¹ = 11999116279 is a prime.

It is a super-2 number, since 2×12001213431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001213481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 666734071 + ... + 666734088.

Almost surely, 2^12001213431 is an apocalyptic number.

12001213431 is a deficient number, since it is larger than the sum of its proper divisors (5333872649).

12001213431 is a wasteful number, since it uses less digits than its factorization.

12001213431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333468165 (or 1333468162 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12001213431 its reverse (13431210021), we get a palindrome (25432423452).

The spelling of 12001213431 in words is "twelve billion, one million, two hundred thirteen thousand, four hundred thirty-one".