102111221077 has 2 divisors, whose sum is σ = 102111221078. Its totient is φ = 102111221076.

The previous prime is 102111221041. The next prime is 102111221221. The reversal of 102111221077 is 770122111201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77056763281 + 25054457796 = 277591^2 + 158286^2 .

It is a cyclic number.

It is not a de Polignac number, because 102111221077 - 2⁷ = 102111220949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102111221027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51055610538 + 51055610539.

It is an arithmetic number, because the mean of its divisors is an integer number (51055610539).

Almost surely, 2^102111221077 is an apocalyptic number.

It is an amenable number.

102111221077 is a deficient number, since it is larger than the sum of its proper divisors (1).

102111221077 is an equidigital number, since it uses as much as digits as its factorization.

102111221077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 25.

Adding to 102111221077 its reverse (770122111201), we get a palindrome (872233332278).

The spelling of 102111221077 in words is "one hundred two billion, one hundred eleven million, two hundred twenty-one thousand, seventy-seven".