2021122022209 has 4 divisors (see below), whose sum is σ = 2021125962580. Its totient is φ = 2021118081840.

The previous prime is 2021122022201. The next prime is 2021122022237. The reversal of 2021122022209 is 9022202211202.

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 1174221468225 + 846900553984 = 1083615^2 + 920272^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021122022209 - 2³ = 2021122022201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021122022201) 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, 1060914 + ... + 2273275.

It is an arithmetic number, because the mean of its divisors is an integer number (505281490645).

Almost surely, 2^{2021122022209} is an apocalyptic number.

It is an amenable number.

2021122022209 is a deficient number, since it is larger than the sum of its proper divisors (3940371).

2021122022209 is an equidigital number, since it uses as much as digits as its factorization.

2021122022209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3940370.

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 2021122022209 in words is "two trillion, twenty-one billion, one hundred twenty-two million, twenty-two thousand, two hundred nine".