102111220111 has 2 divisors, whose sum is σ = 102111220112. Its totient is φ = 102111220110.

The previous prime is 102111220067. The next prime is 102111220121. The reversal of 102111220111 is 111022111201.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102111220111 - 2⁷ = 102111219983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102111220091 and 102111220100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102111220121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51055610055 + 51055610056.

It is an arithmetic number, because the mean of its divisors is an integer number (51055610056).

Almost surely, 2^102111220111 is an apocalyptic number.

102111220111 is a deficient number, since it is larger than the sum of its proper divisors (1).

102111220111 is an equidigital number, since it uses as much as digits as its factorization.

102111220111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 102111220111 its reverse (111022111201), we get a palindrome (213133331312).

The spelling of 102111220111 in words is "one hundred two billion, one hundred eleven million, two hundred twenty thousand, one hundred eleven".