131221311131 has 8 divisors (see below), whose sum is σ = 136949524224. Its totient is φ = 125495009640.

The previous prime is 131221311119. The next prime is 131221311173. The reversal of 131221311131 is 131113122131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131221311131 is a prime.

It is a super-2 number, since 2×131221311131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131221311031) 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, 336725 + ... + 613046.

It is an arithmetic number, because the mean of its divisors is an integer number (17118690528).

Almost surely, 2^131221311131 is an apocalyptic number.

131221311131 is a deficient number, since it is larger than the sum of its proper divisors (5728213093).

131221311131 is an equidigital number, since it uses as much as digits as its factorization.

131221311131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955801.

The product of its digits is 108, while the sum is 20.

Adding to 131221311131 its reverse (131113122131), we get a palindrome (262334433262).

The spelling of 131221311131 in words is "one hundred thirty-one billion, two hundred twenty-one million, three hundred eleven thousand, one hundred thirty-one".