111231220057 has 2 divisors, whose sum is σ = 111231220058. Its totient is φ = 111231220056.

The previous prime is 111231220043. The next prime is 111231220127. The reversal of 111231220057 is 750022132111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106289692441 + 4941527616 = 326021^2 + 70296^2 .

It is a cyclic number.

It is not a de Polignac number, because 111231220057 - 2¹¹ = 111231218009 is a prime.

It is not a weakly prime, because it can be changed into another prime (111231220007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55615610028 + 55615610029.

It is an arithmetic number, because the mean of its divisors is an integer number (55615610029).

Almost surely, 2^111231220057 is an apocalyptic number.

It is an amenable number.

111231220057 is a deficient number, since it is larger than the sum of its proper divisors (1).

111231220057 is an equidigital number, since it uses as much as digits as its factorization.

111231220057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 25.

Adding to 111231220057 its reverse (750022132111), we get a palindrome (861253352168).

The spelling of 111231220057 in words is "one hundred eleven billion, two hundred thirty-one million, two hundred twenty thousand, fifty-seven".