131221331121 has 8 divisors (see below), whose sum is σ = 175191688224. Its totient is φ = 87365930720.

The previous prime is 131221331099. The next prime is 131221331203. The reversal of 131221331121 is 121133122131.

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 131221331121 - 2⁵ = 131221331089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131221331621) 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, 28736511 + ... + 28741076.

It is an arithmetic number, because the mean of its divisors is an integer number (21898961028).

Almost surely, 2^131221331121 is an apocalyptic number.

It is an amenable number.

131221331121 is a deficient number, since it is larger than the sum of its proper divisors (43970357103).

131221331121 is an equidigital number, since it uses as much as digits as its factorization.

131221331121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57478351.

The product of its digits is 216, while the sum is 21.

Adding to 131221331121 its reverse (121133122131), we get a palindrome (252354453252).

The spelling of 131221331121 in words is "one hundred thirty-one billion, two hundred twenty-one million, three hundred thirty-one thousand, one hundred twenty-one".