131232111221 has 4 divisors (see below), whose sum is σ = 132393457452. Its totient is φ = 130070764992.

The previous prime is 131232111217. The next prime is 131232111259. The reversal of 131232111221 is 122111232131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122111232131 = 7 ⋅17444461733.

It can be written as a sum of positive squares in 2 ways, for example, as 51239302321 + 79992808900 = 226361^2 + 282830^2 .

It is a cyclic number.

It is not a de Polignac number, because 131232111221 - 2² = 131232111217 is a prime.

It is a super-2 number, since 2×131232111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131232111193 and 131232111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131232111271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 580672946 + ... + 580673171.

It is an arithmetic number, because the mean of its divisors is an integer number (33098364363).

Almost surely, 2^131232111221 is an apocalyptic number.

It is an amenable number.

131232111221 is a deficient number, since it is larger than the sum of its proper divisors (1161346231).

131232111221 is a wasteful number, since it uses less digits than its factorization.

131232111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161346230.

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

Adding to 131232111221 its reverse (122111232131), we get a palindrome (253343343352).

The spelling of 131232111221 in words is "one hundred thirty-one billion, two hundred thirty-two million, one hundred eleven thousand, two hundred twenty-one".