131122204121 has 4 divisors (see below), whose sum is σ = 132918398772. Its totient is φ = 129326009472.

The previous prime is 131122204111. The next prime is 131122204123. The reversal of 131122204121 is 121402221131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 111846769225 + 19275434896 = 334435^2 + 138836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131122204121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131122204093 and 131122204102.

It is not an unprimeable number, because it can be changed into a prime (131122204123) 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, 898097216 + ... + 898097361.

It is an arithmetic number, because the mean of its divisors is an integer number (33229599693).

Almost surely, 2^131122204121 is an apocalyptic number.

It is an amenable number.

131122204121 is a deficient number, since it is larger than the sum of its proper divisors (1796194651).

131122204121 is an equidigital number, since it uses as much as digits as its factorization.

131122204121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796194650.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 131122204121 its reverse (121402221131), we get a palindrome (252524425252).

The spelling of 131122204121 in words is "one hundred thirty-one billion, one hundred twenty-two million, two hundred four thousand, one hundred twenty-one".