2021022112221 has 80 divisors (see below), whose sum is σ = 3508605201920. Its totient is φ = 1149682766400.

The previous prime is 2021022112211. The next prime is 2021022112267. The reversal of 2021022112221 is 1222112201202.

It is a happy number.

2021022112221 is a `hidden beast` number, since 2 + 0 + 210 + 221 + 12 + 221 = 666.

It is not a de Polignac number, because 2021022112221 - 2²³ = 2021013723613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021022112194 and 2021022112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021022112211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 14386521 + ... + 14526321.

It is an arithmetic number, because the mean of its divisors is an integer number (43857565024).

Almost surely, 2^{2021022112221} is an apocalyptic number.

2021022112221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2021022112221 is a deficient number, since it is larger than the sum of its proper divisors (1487583089699).

2021022112221 is an equidigital number, since it uses as much as digits as its factorization.

2021022112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140061 (or 140034 counting only the distinct ones).

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

Adding to 2021022112221 its reverse (1222112201202), we get a palindrome (3243134313423).

The spelling of 2021022112221 in words is "two trillion, twenty-one billion, twenty-two million, one hundred twelve thousand, two hundred twenty-one".