2011222221 has 8 divisors (see below), whose sum is σ = 2681928480. Its totient is φ = 1340665392.

The previous prime is 2011222163. The next prime is 2011222229. The reversal of 2011222221 is 1222221102.

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

It is not a de Polignac number, because 2011222221 - 2⁷ = 2011222093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2011222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011222229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855 + ... + 63428.

It is an arithmetic number, because the mean of its divisors is an integer number (335241060).

Almost surely, 2^2011222221 is an apocalyptic number.

It is an amenable number.

2011222221 is a deficient number, since it is larger than the sum of its proper divisors (670706259).

2011222221 is a wasteful number, since it uses less digits than its factorization.

2011222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74715.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2011222221 is about 44846.6522830857. The cubic root of 2011222221 is about 1262.2731747650.

Adding to 2011222221 its reverse (1222221102), we get a palindrome (3233443323).

The spelling of 2011222221 in words is "two billion, eleven million, two hundred twenty-two thousand, two hundred twenty-one".