131111120221 has 2 divisors, whose sum is σ = 131111120222. Its totient is φ = 131111120220.

The previous prime is 131111120183. The next prime is 131111120249. The reversal of 131111120221 is 122021111131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93566244996 + 37544875225 = 305886^2 + 193765^2 .

It is a cyclic number.

It is not a de Polignac number, because 131111120221 - 2⁹ = 131111119709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131111120195 and 131111120204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131111120321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65555560110 + 65555560111.

It is an arithmetic number, because the mean of its divisors is an integer number (65555560111).

Almost surely, 2^131111120221 is an apocalyptic number.

It is an amenable number.

131111120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

131111120221 is an equidigital number, since it uses as much as digits as its factorization.

131111120221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 131111120221 its reverse (122021111131), we get a palindrome (253132231352).

The spelling of 131111120221 in words is "one hundred thirty-one billion, one hundred eleven million, one hundred twenty thousand, two hundred twenty-one".