111021221858077 has 2 divisors, whose sum is σ = 111021221858078. Its totient is φ = 111021221858076.

The previous prime is 111021221858009. The next prime is 111021221858111. The reversal of 111021221858077 is 770858122120111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59726605433401 + 51294616424676 = 7728299^2 + 7162026^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111021221858077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111021221858977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510610929038 + 55510610929039.

It is an arithmetic number, because the mean of its divisors is an integer number (55510610929039).

Almost surely, 2^{111021221858077} is an apocalyptic number.

It is an amenable number.

111021221858077 is a deficient number, since it is larger than the sum of its proper divisors (1).

111021221858077 is an equidigital number, since it uses as much as digits as its factorization.

111021221858077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125440, while the sum is 46.

Adding to 111021221858077 its reverse (770858122120111), we get a palindrome (881879343978188).

The spelling of 111021221858077 in words is "one hundred eleven trillion, twenty-one billion, two hundred twenty-one million, eight hundred fifty-eight thousand, seventy-seven".