131120321221 has 2 divisors, whose sum is σ = 131120321222. Its totient is φ = 131120321220.

The previous prime is 131120321183. The next prime is 131120321263. The reversal of 131120321221 is 122123021131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79840718721 + 51279602500 = 282561^2 + 226450^2 .

It is a cyclic number.

It is not a de Polignac number, because 131120321221 - 2¹³ = 131120313029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131120321821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65560160610 + 65560160611.

It is an arithmetic number, because the mean of its divisors is an integer number (65560160611).

Almost surely, 2^131120321221 is an apocalyptic number.

It is an amenable number.

131120321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

131120321221 is an equidigital number, since it uses as much as digits as its factorization.

131120321221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 131120321221 its reverse (122123021131), we get a palindrome (253243342352).

The spelling of 131120321221 in words is "one hundred thirty-one billion, one hundred twenty million, three hundred twenty-one thousand, two hundred twenty-one".