102012111 has 12 divisors (see below), whose sum is σ = 152432280. Its totient is φ = 65662800.

The previous prime is 102012091. The next prime is 102012133. The reversal of 102012111 is 111210201.

It is a happy number.

It is not a de Polignac number, because 102012111 - 2⁹ = 102011599 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 = 102012093 and 102012102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102012181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195165 + ... + 195686.

It is an arithmetic number, because the mean of its divisors is an integer number (12702690).

Almost surely, 2^102012111 is an apocalyptic number.

102012111 is a deficient number, since it is larger than the sum of its proper divisors (50420169).

102012111 is a wasteful number, since it uses less digits than its factorization.

102012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390886 (or 390883 counting only the distinct ones).

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

The square root of 102012111 is about 10100.1045044098. The cubic root of 102012111 is about 467.2513644479.

Adding to 102012111 its reverse (111210201), we get a palindrome (213222312).

It can be divided in two parts, 1020 and 12111, that added together give a palindrome (13131).

The spelling of 102012111 in words is "one hundred two million, twelve thousand, one hundred eleven".