2020021221 has 8 divisors (see below), whose sum is σ = 2718533664. Its totient is φ = 1334094800.

The previous prime is 2020021219. The next prime is 2020021229. The reversal of 2020021221 is 1221200202.

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

It is a cyclic number.

It is not a de Polignac number, because 2020021221 - 2¹ = 2020021219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2020021197 and 2020021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020021229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3146130 + ... + 3146771.

It is an arithmetic number, because the mean of its divisors is an integer number (339816708).

Almost surely, 2^2020021221 is an apocalyptic number.

It is an amenable number.

2020021221 is a deficient number, since it is larger than the sum of its proper divisors (698512443).

2020021221 is a wasteful number, since it uses less digits than its factorization.

2020021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6293011.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2020021221 is about 44944.6461883949. The cubic root of 2020021221 is about 1264.1112915164. Note that the first 3 decimals are identical.

Adding to 2020021221 its reverse (1221200202), we get a palindrome (3241221423).

The spelling of 2020021221 in words is "two billion, twenty million, twenty-one thousand, two hundred twenty-one".