2021541221 has 8 divisors (see below), whose sum is σ = 2310843264. Its totient is φ = 1732366800.

The previous prime is 2021541143. The next prime is 2021541227. The reversal of 2021541221 is 1221451202.

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 2021541221 - 2¹⁰ = 2021540197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021541193 and 2021541202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021541227) 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, 4871 + ... + 63771.

It is an arithmetic number, because the mean of its divisors is an integer number (288855408).

Almost surely, 2^2021541221 is an apocalyptic number.

It is an amenable number.

2021541221 is a deficient number, since it is larger than the sum of its proper divisors (289302043).

2021541221 is an equidigital number, since it uses as much as digits as its factorization.

2021541221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63811.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 2021541221 is about 44961.5526978328. The cubic root of 2021541221 is about 1264.4282795100.

Adding to 2021541221 its reverse (1221451202), we get a palindrome (3242992423).

The spelling of 2021541221 in words is "two billion, twenty-one million, five hundred forty-one thousand, two hundred twenty-one".