2021210009 has 8 divisors (see below), whose sum is σ = 2487643200. Its totient is φ = 1599199056.

The previous prime is 2021209921. The next prime is 2021210011. The reversal of 2021210009 is 9000121202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2021210009 - 2²⁸ = 1752774553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2021210029) 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, 11105459 + ... + 11105640.

It is an arithmetic number, because the mean of its divisors is an integer number (310955400).

Almost surely, 2^2021210009 is an apocalyptic number.

It is an amenable number.

2021210009 is a deficient number, since it is larger than the sum of its proper divisors (466433191).

2021210009 is a wasteful number, since it uses less digits than its factorization.

2021210009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22211119.

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

The square root of 2021210009 is about 44957.8692666812. The cubic root of 2021210009 is about 1264.3592205351.

The spelling of 2021210009 in words is "two billion, twenty-one million, two hundred ten thousand, nine".