2021220111 has 8 divisors (see below), whose sum is σ = 2697896320. Its totient is φ = 1346011992.

The previous prime is 2021220109. The next prime is 2021220139. The reversal of 2021220111 is 1110221202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2021220111 - 2¹ = 2021220109 is a prime.

It is a super-2 number, since 2×2021220111² = 8170661474221704642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021220161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 363805 + ... + 369318.

It is an arithmetic number, because the mean of its divisors is an integer number (337237040).

Almost surely, 2^2021220111 is an apocalyptic number.

2021220111 is a deficient number, since it is larger than the sum of its proper divisors (676676209).

2021220111 is an equidigital number, since it uses as much as digits as its factorization.

2021220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734045.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2021220111 is about 44957.9816161713. The cubic root of 2021220111 is about 1264.3613269525.

Adding to 2021220111 its reverse (1110221202), we get a palindrome (3131441313).

The spelling of 2021220111 in words is "two billion, twenty-one million, two hundred twenty thousand, one hundred eleven".