2102002109 has 2 divisors, whose sum is σ = 2102002110. Its totient is φ = 2102002108.

The previous prime is 2102002093. The next prime is 2102002139. The reversal of 2102002109 is 9012002012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1969406884 + 132595225 = 44378^2 + 11515^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102002109 - 2⁴ = 2102002093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102002139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051001054 + 1051001055.

It is an arithmetic number, because the mean of its divisors is an integer number (1051001055).

Almost surely, 2^2102002109 is an apocalyptic number.

It is an amenable number.

2102002109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102002109 is an equidigital number, since it uses as much as digits as its factorization.

2102002109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2102002109 is about 45847.5965455115. The cubic root of 2102002109 is about 1280.9859974829.

The spelling of 2102002109 in words is "two billion, one hundred two million, two thousand, one hundred nine".