131333121221 has 4 divisors (see below), whose sum is σ = 131364567372. Its totient is φ = 131301675072.

The previous prime is 131333121209. The next prime is 131333121247. The reversal of 131333121221 is 122121333131.

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 93950832196 + 37382289025 = 306514^2 + 193345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131333121221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131336121221) 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, 15716810 + ... + 15725163.

It is an arithmetic number, because the mean of its divisors is an integer number (32841141843).

Almost surely, 2^131333121221 is an apocalyptic number.

It is an amenable number.

131333121221 is a deficient number, since it is larger than the sum of its proper divisors (31446151).

131333121221 is an equidigital number, since it uses as much as digits as its factorization.

131333121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31446150.

The product of its digits is 648, while the sum is 23.

Adding to 131333121221 its reverse (122121333131), we get a palindrome (253454454352).

The spelling of 131333121221 in words is "one hundred thirty-one billion, three hundred thirty-three million, one hundred twenty-one thousand, two hundred twenty-one".