2111111221 has 8 divisors (see below), whose sum is σ = 2252897280. Its totient is φ = 1971281088.

The previous prime is 2111111213. The next prime is 2111111291. The reversal of 2111111221 is 1221111112.

It is a happy number.

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 2111111221 - 2³ = 2111111213 is a prime.

It is a super-2 number, since 2×2111111221² = 8913581174864221682, 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 (2111111291) 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, 486751 + ... + 491068.

It is an arithmetic number, because the mean of its divisors is an integer number (281612160).

Almost surely, 2^2111111221 is an apocalyptic number.

It is an amenable number.

2111111221 is a deficient number, since it is larger than the sum of its proper divisors (141786059).

2111111221 is a wasteful number, since it uses less digits than its factorization.

2111111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977963.

The product of its digits is 8, while the sum is 13.

The square root of 2111111221 is about 45946.8303694607. The cubic root of 2111111221 is about 1282.8337326839.

Adding to 2111111221 its reverse (1221111112), we get a palindrome (3332222333).

The spelling of 2111111221 in words is "two billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-one".