102120111109 has 4 divisors (see below), whose sum is σ = 103131201420. Its totient is φ = 101109020800.

The previous prime is 102120111011. The next prime is 102120111151. The reversal of 102120111109 is 901111021201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 901111021201 = 109 ⋅8267073589.

It can be written as a sum of positive squares in 2 ways, for example, as 63509040100 + 38611071009 = 252010^2 + 196497^2 .

It is a cyclic number.

It is not a de Polignac number, because 102120111109 - 2³³ = 93530176517 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 (102120111199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505545004 + ... + 505545205.

It is an arithmetic number, because the mean of its divisors is an integer number (25782800355).

Almost surely, 2^102120111109 is an apocalyptic number.

It is an amenable number.

102120111109 is a deficient number, since it is larger than the sum of its proper divisors (1011090311).

102120111109 is a wasteful number, since it uses less digits than its factorization.

102120111109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011090310.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 102120111109 in words is "one hundred two billion, one hundred twenty million, one hundred eleven thousand, one hundred nine".