131122131221 has 8 divisors (see below), whose sum is σ = 136902636864. Its totient is φ = 125348254240.

The previous prime is 131122131209. The next prime is 131122131247. The reversal of 131122131221 is 122131221131.

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 131122131221 - 2⁶ = 131122131157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131122131193 and 131122131202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131122137221) 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, 1616711 + ... + 1695876.

It is an arithmetic number, because the mean of its divisors is an integer number (17112829608).

Almost surely, 2^131122131221 is an apocalyptic number.

It is an amenable number.

131122131221 is a deficient number, since it is larger than the sum of its proper divisors (5780505643).

131122131221 is a wasteful number, since it uses less digits than its factorization.

131122131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3314331.

The product of its digits is 144, while the sum is 20.

Adding to 131122131221 its reverse (122131221131), we get a palindrome (253253352352).

The spelling of 131122131221 in words is "one hundred thirty-one billion, one hundred twenty-two million, one hundred thirty-one thousand, two hundred twenty-one".