111745320221 has 2 divisors, whose sum is σ = 111745320222. Its totient is φ = 111745320220.

The previous prime is 111745320131. The next prime is 111745320241. The reversal of 111745320221 is 122023547111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62898132025 + 48847188196 = 250795^2 + 221014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111745320221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111745320241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55872660110 + 55872660111.

It is an arithmetic number, because the mean of its divisors is an integer number (55872660111).

Almost surely, 2^111745320221 is an apocalyptic number.

It is an amenable number.

111745320221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111745320221 is an equidigital number, since it uses as much as digits as its factorization.

111745320221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 111745320221 its reverse (122023547111), we get a palindrome (233768867332).

The spelling of 111745320221 in words is "one hundred eleven billion, seven hundred forty-five million, three hundred twenty thousand, two hundred twenty-one".