102121102109 has 4 divisors (see below), whose sum is σ = 109976571516. Its totient is φ = 94265632704.

The previous prime is 102121102103. The next prime is 102121102117. The reversal of 102121102109 is 901201121201.

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 19979822500 + 82141279609 = 141350^2 + 286603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102121102109 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 (102121102103) 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, 3927734684 + ... + 3927734709.

It is an arithmetic number, because the mean of its divisors is an integer number (27494142879).

Almost surely, 2^102121102109 is an apocalyptic number.

It is an amenable number.

102121102109 is a deficient number, since it is larger than the sum of its proper divisors (7855469407).

102121102109 is an equidigital number, since it uses as much as digits as its factorization.

102121102109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7855469406.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 102121102109 in words is "one hundred two billion, one hundred twenty-one million, one hundred two thousand, one hundred nine".