12131200421 has 4 divisors (see below), whose sum is σ = 12284760000. Its totient is φ = 11977640844.

The previous prime is 12131200387. The next prime is 12131200423. The reversal of 12131200421 is 12400213121.

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: 12400213121 = 919 ⋅13493159.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12131200421 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 12131200421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131200423) 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, 76779671 + ... + 76779828.

It is an arithmetic number, because the mean of its divisors is an integer number (3071190000).

Almost surely, 2^12131200421 is an apocalyptic number.

It is an amenable number.

12131200421 is a deficient number, since it is larger than the sum of its proper divisors (153559579).

12131200421 is an equidigital number, since it uses as much as digits as its factorization.

12131200421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153559578.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12131200421 its reverse (12400213121), we get a palindrome (24531413542).

The spelling of 12131200421 in words is "twelve billion, one hundred thirty-one million, two hundred thousand, four hundred twenty-one".