131143441221 has 24 divisors (see below), whose sum is σ = 204025958136. Its totient is φ = 80693746560.

The previous prime is 131143441199. The next prime is 131143441243. The reversal of 131143441221 is 122144341131.

It is a happy number.

131143441221 is a `hidden beast` number, since 1 + 3 + 1 + 1 + 434 + 4 + 1 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (131143441199) and next prime (131143441243).

It can be written as a sum of positive squares in 4 ways, for example, as 3347201025 + 127796240196 = 57855^2 + 357486^2 .

It is not a de Polignac number, because 131143441221 - 2⁹ = 131143440709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131143441621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 952611 + ... + 1081551.

It is an arithmetic number, because the mean of its divisors is an integer number (8501081589).

Almost surely, 2^131143441221 is an apocalyptic number.

It is an amenable number.

131143441221 is a deficient number, since it is larger than the sum of its proper divisors (72882516915).

131143441221 is a wasteful number, since it uses less digits than its factorization.

131143441221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137653 (or 137650 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

Adding to 131143441221 its reverse (122144341131), we get a palindrome (253287782352).

The spelling of 131143441221 in words is "one hundred thirty-one billion, one hundred forty-three million, four hundred forty-one thousand, two hundred twenty-one".