131043221021 has 4 divisors (see below), whose sum is σ = 131062010172. Its totient is φ = 131024431872.

The previous prime is 131043221017. The next prime is 131043221053. The reversal of 131043221021 is 120122340131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120122340131 = 6277 ⋅19136903.

It can be written as a sum of positive squares in 2 ways, for example, as 50620500100 + 80422720921 = 224990^2 + 283589^2 .

It is a cyclic number.

It is not a de Polignac number, because 131043221021 - 2² = 131043221017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131043220984 and 131043221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131043221921) 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, 9384110 + ... + 9398063.

It is an arithmetic number, because the mean of its divisors is an integer number (32765502543).

Almost surely, 2^131043221021 is an apocalyptic number.

It is an amenable number.

131043221021 is a deficient number, since it is larger than the sum of its proper divisors (18789151).

131043221021 is an equidigital number, since it uses as much as digits as its factorization.

131043221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18789150.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 131043221021 its reverse (120122340131), we get a palindrome (251165561152).

The spelling of 131043221021 in words is "one hundred thirty-one billion, forty-three million, two hundred twenty-one thousand, twenty-one".