2021220209 has 4 divisors (see below), whose sum is σ = 2127600240. Its totient is φ = 1914840180.

The previous prime is 2021220193. The next prime is 2021220211. The reversal of 2021220209 is 9020221202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021220209 - 2⁴ = 2021220193 is a prime.

It is a super-2 number, since 2×2021220209² = 8170662266540007362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2021220239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53189987 + ... + 53190024.

It is an arithmetic number, because the mean of its divisors is an integer number (531900060).

Almost surely, 2^2021220209 is an apocalyptic number.

It is an amenable number.

2021220209 is a deficient number, since it is larger than the sum of its proper divisors (106380031).

2021220209 is a wasteful number, since it uses less digits than its factorization.

2021220209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106380030.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2021220209 is about 44957.9827060779. The cubic root of 2021220209 is about 1264.3613473869.

The spelling of 2021220209 in words is "two billion, twenty-one million, two hundred twenty thousand, two hundred nine".