2121222111 has 8 divisors (see below), whose sum is σ = 2977153920. Its totient is φ = 1339719192.

The previous prime is 2121222109. The next prime is 2121222163. The reversal of 2121222111 is 1112221212.

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

It is not a de Polignac number, because 2121222111 - 2¹ = 2121222109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121222011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18607155 + ... + 18607268.

It is an arithmetic number, because the mean of its divisors is an integer number (372144240).

Almost surely, 2^2121222111 is an apocalyptic number.

2121222111 is a deficient number, since it is larger than the sum of its proper divisors (855931809).

2121222111 is a wasteful number, since it uses less digits than its factorization.

2121222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37214445.

The product of its digits is 32, while the sum is 15.

The square root of 2121222111 is about 46056.7270982210. The cubic root of 2121222111 is about 1284.8784597406.

Adding to 2121222111 its reverse (1112221212), we get a palindrome (3233443323).

The spelling of 2121222111 in words is "two billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".