10202120009 has 4 divisors (see below), whose sum is σ = 10369367940. Its totient is φ = 10034872080.

The previous prime is 10202119997. The next prime is 10202120011. The reversal of 10202120009 is 90002120201.

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 714385984 + 9487734025 = 26728^2 + 97405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10202120009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10202120099) 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, 83623874 + ... + 83623995.

It is an arithmetic number, because the mean of its divisors is an integer number (2592341985).

Almost surely, 2^10202120009 is an apocalyptic number.

It is an amenable number.

10202120009 is a deficient number, since it is larger than the sum of its proper divisors (167247931).

10202120009 is an equidigital number, since it uses as much as digits as its factorization.

10202120009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167247930.

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

The spelling of 10202120009 in words is "ten billion, two hundred two million, one hundred twenty thousand, nine".