131222021133121 has 4 divisors (see below), whose sum is σ = 131980529925972. Its totient is φ = 130463512340272.

The previous prime is 131222021133113. The next prime is 131222021133167. The reversal of 131222021133121 is 121331120222131.

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 53660181246721 + 77561839886400 = 7325311^2 + 8806920^2 .

It is a cyclic number.

It is not a de Polignac number, because 131222021133121 - 2³ = 131222021133113 is a prime.

It is a super-2 number, since 2×131222021133121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131222021133191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379254396166 + ... + 379254396511.

It is an arithmetic number, because the mean of its divisors is an integer number (32995132481493).

Almost surely, 2^{131222021133121} is an apocalyptic number.

It is an amenable number.

131222021133121 is a deficient number, since it is larger than the sum of its proper divisors (758508792851).

131222021133121 is an equidigital number, since it uses as much as digits as its factorization.

131222021133121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758508792850.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 131222021133121 its reverse (121331120222131), we get a palindrome (252553141355252).

The spelling of 131222021133121 in words is "one hundred thirty-one trillion, two hundred twenty-two billion, twenty-one million, one hundred thirty-three thousand, one hundred twenty-one".