2021120212221 has 24 divisors (see below), whose sum is σ = 3190452404256. Its totient is φ = 1222745603040.

The previous prime is 2021120212217. The next prime is 2021120212259. The reversal of 2021120212221 is 1222120211202.

It is a happy number.

2021120212221 is a `hidden beast` number, since 2 + 0 + 211 + 20 + 212 + 221 = 666.

It is not a de Polignac number, because 2021120212221 - 2² = 2021120212217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021120212194 and 2021120212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021120212121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18075130 + ... + 18186603.

It is an arithmetic number, because the mean of its divisors is an integer number (132935516844).

Almost surely, 2^{2021120212221} is an apocalyptic number.

It is an amenable number.

2021120212221 is a deficient number, since it is larger than the sum of its proper divisors (1169332192035).

2021120212221 is a wasteful number, since it uses less digits than its factorization.

2021120212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36262313 (or 36262310 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2021120212221 its reverse (1222120211202), we get a palindrome (3243240423423).

The spelling of 2021120212221 in words is "two trillion, twenty-one billion, one hundred twenty million, two hundred twelve thousand, two hundred twenty-one".