2021020221 has 16 divisors (see below), whose sum is σ = 2995133760. Its totient is φ = 1201749120.

The previous prime is 2021020217. The next prime is 2021020223. The reversal of 2021020221 is 1220201202.

It is not a de Polignac number, because 2021020221 - 2² = 2021020217 is a prime.

It is a super-3 number, since 3×2021020221³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2021020197 and 2021020206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021020223) 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 15 ways as a sum of consecutive naturals, for example, 576016 + ... + 579513.

It is an arithmetic number, because the mean of its divisors is an integer number (187195860).

Almost surely, 2^2021020221 is an apocalyptic number.

It is an amenable number.

2021020221 is a deficient number, since it is larger than the sum of its proper divisors (974113539).

2021020221 is a wasteful number, since it uses less digits than its factorization.

2021020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155596.

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

The square root of 2021020221 is about 44955.7584854265. The cubic root of 2021020221 is about 1264.3196456076.

Adding to 2021020221 its reverse (1220201202), we get a palindrome (3241221423).

The spelling of 2021020221 in words is "two billion, twenty-one million, twenty thousand, two hundred twenty-one".