2021112221 has 8 divisors (see below), whose sum is σ = 2047795200. Its totient is φ = 1994456880.

The previous prime is 2021112217. The next prime is 2021112227. The reversal of 2021112221 is 1222111202.

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 2021112221 - 2² = 2021112217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2021112196 and 2021112205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021112227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169700 + ... + 181218.

It is an arithmetic number, because the mean of its divisors is an integer number (255974400).

Almost surely, 2^2021112221 is an apocalyptic number.

It is an amenable number.

2021112221 is a deficient number, since it is larger than the sum of its proper divisors (26682979).

2021112221 is a wasteful number, since it uses less digits than its factorization.

2021112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13819.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2021112221 is about 44956.7817019857. The cubic root of 2021112221 is about 1264.3388299188.

Adding to 2021112221 its reverse (1222111202), we get a palindrome (3243223423).

The spelling of 2021112221 in words is "two billion, twenty-one million, one hundred twelve thousand, two hundred twenty-one".