111221123257 has 2 divisors, whose sum is σ = 111221123258. Its totient is φ = 111221123256.

The previous prime is 111221123249. The next prime is 111221123261. The reversal of 111221123257 is 752321122111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110875014441 + 346108816 = 332979^2 + 18604^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221123257 - 2³ = 111221123249 is a prime.

It is not a weakly prime, because it can be changed into another prime (111221123267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610561628 + 55610561629.

It is an arithmetic number, because the mean of its divisors is an integer number (55610561629).

Almost surely, 2^111221123257 is an apocalyptic number.

It is an amenable number.

111221123257 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221123257 is an equidigital number, since it uses as much as digits as its factorization.

111221123257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 28.

Adding to 111221123257 its reverse (752321122111), we get a palindrome (863542245368).

The spelling of 111221123257 in words is "one hundred eleven billion, two hundred twenty-one million, one hundred twenty-three thousand, two hundred fifty-seven".