2021120210221 has 16 divisors (see below), whose sum is σ = 2364570374400. Its totient is φ = 1726818278640.

The previous prime is 2021120210201. The next prime is 2021120210251. The reversal of 2021120210221 is 1220120211202.

It is a happy number.

It is not a de Polignac number, because 2021120210221 - 2¹⁹ = 2021119685933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021120210195 and 2021120210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021120210201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9366766 + ... + 9580111.

It is an arithmetic number, because the mean of its divisors is an integer number (147785648400).

Almost surely, 2^{2021120210221} is an apocalyptic number.

It is an amenable number.

2021120210221 is a deficient number, since it is larger than the sum of its proper divisors (343450164179).

2021120210221 is an equidigital number, since it uses as much as digits as its factorization.

2021120210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18947209 (or 18947195 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2021120210221 its reverse (1220120211202), we get a palindrome (3241240421423).

The spelling of 2021120210221 in words is "two trillion, twenty-one billion, one hundred twenty million, two hundred ten thousand, two hundred twenty-one".