2020221221 has 4 divisors (see below), whose sum is σ = 2025552000. Its totient is φ = 2014890444.

The previous prime is 2020221187. The next prime is 2020221223. The reversal of 2020221221 is 1221220202.

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 2020221221 - 2¹⁰ = 2020220197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2020221196 and 2020221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020221223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2664821 + ... + 2665578.

It is an arithmetic number, because the mean of its divisors is an integer number (506388000).

Almost surely, 2^2020221221 is an apocalyptic number.

It is an amenable number.

2020221221 is a deficient number, since it is larger than the sum of its proper divisors (5330779).

2020221221 is an equidigital number, since it uses as much as digits as its factorization.

2020221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330778.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2020221221 is about 44946.8710924353. The cubic root of 2020221221 is about 1264.1530095459.

Adding to 2020221221 its reverse (1221220202), we get a palindrome (3241441423).

The spelling of 2020221221 in words is "two billion, twenty million, two hundred twenty-one thousand, two hundred twenty-one".