12131221231121 has 8 divisors (see below), whose sum is σ = 12198975110784. Its totient is φ = 12063650718960.

The previous prime is 12131221231117. The next prime is 12131221231127. The reversal of 12131221231121 is 12113212213121.

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

It is a cyclic number.

It is not a de Polignac number, because 12131221231121 - 2² = 12131221231117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12131221231127) 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, 45709190 + ... + 45973823.

It is an arithmetic number, because the mean of its divisors is an integer number (1524871888848).

Almost surely, 2^{12131221231121} is an apocalyptic number.

It is an amenable number.

12131221231121 is a deficient number, since it is larger than the sum of its proper divisors (67753879663).

12131221231121 is an equidigital number, since it uses as much as digits as its factorization.

12131221231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91683751.

The product of its digits is 288, while the sum is 23.

Adding to 12131221231121 its reverse (12113212213121), we get a palindrome (24244433444242).

The spelling of 12131221231121 in words is "twelve trillion, one hundred thirty-one billion, two hundred twenty-one million, two hundred thirty-one thousand, one hundred twenty-one".