2211122121 has 16 divisors (see below), whose sum is σ = 3176468736. Its totient is φ = 1360037376.

The previous prime is 2211122113. The next prime is 2211122129. The reversal of 2211122121 is 1212211122.

It is an interprime number because it is at equal distance from previous prime (2211122113) and next prime (2211122129).

It is not a de Polignac number, because 2211122121 - 2³ = 2211122113 is a prime.

It is a super-2 number, since 2×2211122121² = 9778122067951077282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2211122121.

It is not an unprimeable number, because it can be changed into a prime (2211122129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76176 + ... + 101118.

It is an arithmetic number, because the mean of its divisors is an integer number (198529296).

Almost surely, 2^2211122121 is an apocalyptic number.

It is an amenable number.

2211122121 is a deficient number, since it is larger than the sum of its proper divisors (965346615).

2211122121 is a wasteful number, since it uses less digits than its factorization.

2211122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27232.

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

The square root of 2211122121 is about 47022.5703359568. The cubic root of 2211122121 is about 1302.7794812651.

Adding to 2211122121 its reverse (1212211122), we get a palindrome (3423333243).

It can be divided in two parts, 2211122 and 121, that multiplied together give a palindrome (267545762).

The spelling of 2211122121 in words is "two billion, two hundred eleven million, one hundred twenty-two thousand, one hundred twenty-one".