102102111 has 12 divisors (see below), whose sum is σ = 148145088. Its totient is φ = 67761504.

The previous prime is 102102109. The next prime is 102102139. The reversal of 102102111 is 111201201.

It is a happy number.

It is not a de Polignac number, because 102102111 - 2¹ = 102102109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 102102093 and 102102102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102100111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23430 + ... + 27443.

It is an arithmetic number, because the mean of its divisors is an integer number (12345424).

Almost surely, 2^102102111 is an apocalyptic number.

102102111 is a deficient number, since it is larger than the sum of its proper divisors (46042977).

102102111 is a wasteful number, since it uses less digits than its factorization.

102102111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51102 (or 51099 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 102102111 is about 10104.5589215957. The cubic root of 102102111 is about 467.3887346140.

Adding to 102102111 its reverse (111201201), we get a palindrome (213303312).

It can be divided in two parts, 10210 and 2111, that added together give a palindrome (12321).

The spelling of 102102111 in words is "one hundred two million, one hundred two thousand, one hundred eleven".