102111013 has 4 divisors (see below), whose sum is σ = 103509868. Its totient is φ = 100712160.

The previous prime is 102110971. The next prime is 102111029. The reversal of 102111013 is 310111201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53919649 + 48191364 = 7343^2 + 6942^2 .

It is a cyclic number.

It is not a de Polignac number, because 102111013 - 2²¹ = 100013861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102114013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699318 + ... + 699463.

It is an arithmetic number, because the mean of its divisors is an integer number (25877467).

Almost surely, 2^102111013 is an apocalyptic number.

It is an amenable number.

102111013 is a deficient number, since it is larger than the sum of its proper divisors (1398855).

102111013 is an equidigital number, since it uses as much as digits as its factorization.

102111013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398854.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 102111013 is about 10104.9994062345. Note that the first 3 decimals coincide. The cubic root of 102111013 is about 467.4023176619.

Adding to 102111013 its reverse (310111201), we get a palindrome (412222214).

The spelling of 102111013 in words is "one hundred two million, one hundred eleven thousand, thirteen".