12131221323 has 8 divisors (see below), whose sum is σ = 17419189648. Its totient is φ = 7465366944.

The previous prime is 12131221321. The next prime is 12131221337. The reversal of 12131221323 is 32312213121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12131221323 - 2¹ = 12131221321 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 12131221323.

It is not an unprimeable number, because it can be changed into a prime (12131221321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155528440 + ... + 155528517.

It is an arithmetic number, because the mean of its divisors is an integer number (2177398706).

Almost surely, 2^12131221323 is an apocalyptic number.

12131221323 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12131221323 is a deficient number, since it is larger than the sum of its proper divisors (5287968325).

12131221323 is a wasteful number, since it uses less digits than its factorization.

12131221323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311056973.

The product of its digits is 432, while the sum is 21.

Adding to 12131221323 its reverse (32312213121), we get a palindrome (44443434444).

The spelling of 12131221323 in words is "twelve billion, one hundred thirty-one million, two hundred twenty-one thousand, three hundred twenty-three".