2221021111 has 4 divisors (see below), whose sum is σ = 2222999992. Its totient is φ = 2219042232.

The previous prime is 2221021087. The next prime is 2221021129. The reversal of 2221021111 is 1111201222.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2221021111 - 2⁷ = 2221020983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221021091 and 2221021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221021141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 987756 + ... + 990001.

It is an arithmetic number, because the mean of its divisors is an integer number (555749998).

Almost surely, 2^2221021111 is an apocalyptic number.

2221021111 is a deficient number, since it is larger than the sum of its proper divisors (1978881).

2221021111 is a wasteful number, since it uses less digits than its factorization.

2221021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978880.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2221021111 is about 47127.7106488316. The cubic root of 2221021111 is about 1304.7207284451.

Adding to 2221021111 its reverse (1111201222), we get a palindrome (3332222333).

The spelling of 2221021111 in words is "two billion, two hundred twenty-one million, twenty-one thousand, one hundred eleven".