2101023009 has 8 divisors (see below), whose sum is σ = 3112626720. Its totient is φ = 1400681988.

The previous prime is 2101022993. The next prime is 2101023053. The reversal of 2101023009 is 9003201012.

It is a happy number.

It is not a de Polignac number, because 2101023009 - 2⁴ = 2101022993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101022982 and 2101023000.

It is not an unprimeable number, because it can be changed into a prime (2101023209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38907807 + ... + 38907860.

It is an arithmetic number, because the mean of its divisors is an integer number (389078340).

Almost surely, 2^2101023009 is an apocalyptic number.

It is an amenable number.

2101023009 is a deficient number, since it is larger than the sum of its proper divisors (1011603711).

2101023009 is an equidigital number, since it uses as much as digits as its factorization.

2101023009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77815676 (or 77815670 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2101023009 is about 45836.9175337958. The cubic root of 2101023009 is about 1280.7870747241.

The spelling of 2101023009 in words is "two billion, one hundred one million, twenty-three thousand, nine".