12001013231 has 4 divisors (see below), whose sum is σ = 12016620000. Its totient is φ = 11985406464.

The previous prime is 12001013221. The next prime is 12001013239. The reversal of 12001013231 is 13231010021.

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

It is a cyclic number.

It is not a de Polignac number, because 12001013231 - 2¹⁰ = 12001012207 is a prime.

It is a super-2 number, since 2×12001013231² (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 (12001013239) 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, 7802231 + ... + 7803768.

It is an arithmetic number, because the mean of its divisors is an integer number (3004155000).

Almost surely, 2^12001013231 is an apocalyptic number.

12001013231 is a deficient number, since it is larger than the sum of its proper divisors (15606769).

12001013231 is an equidigital number, since it uses as much as digits as its factorization.

12001013231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15606768.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 12001013231 its reverse (13231010021), we get a palindrome (25232023252).

The spelling of 12001013231 in words is "twelve billion, one million, thirteen thousand, two hundred thirty-one".