131340221 has 4 divisors (see below), whose sum is σ = 131412000. Its totient is φ = 131268444.

The previous prime is 131340169. The next prime is 131340247. The reversal of 131340221 is 122043131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131340221 - 2¹⁴ = 131323837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131340221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131340271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33071 + ... + 36828.

It is an arithmetic number, because the mean of its divisors is an integer number (32853000).

Almost surely, 2^131340221 is an apocalyptic number.

It is an amenable number.

131340221 is a deficient number, since it is larger than the sum of its proper divisors (71779).

131340221 is an equidigital number, since it uses as much as digits as its factorization.

131340221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71778.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 131340221 is about 11460.3761282080. The cubic root of 131340221 is about 508.3145965562.

Adding to 131340221 its reverse (122043131), we get a palindrome (253383352).

The spelling of 131340221 in words is "one hundred thirty-one million, three hundred forty thousand, two hundred twenty-one".