2212121121 has 24 divisors (see below), whose sum is σ = 3435157440. Its totient is φ = 1262554272.

The previous prime is 2212121099. The next prime is 2212121137. The reversal of 2212121121 is 1211212122.

It is not a de Polignac number, because 2212121121 - 2¹⁴ = 2212104737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2212121121.

It is not an unprimeable number, because it can be changed into a prime (2212121521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120340 + ... + 137498.

It is an arithmetic number, because the mean of its divisors is an integer number (143131560).

Almost surely, 2^2212121121 is an apocalyptic number.

2212121121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2212121121 is a deficient number, since it is larger than the sum of its proper divisors (1223036319).

2212121121 is a wasteful number, since it uses less digits than its factorization.

2212121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18053 (or 18046 counting only the distinct ones).

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

The square root of 2212121121 is about 47033.1916948021. The cubic root of 2212121121 is about 1302.9756532651.

Adding to 2212121121 its reverse (1211212122), we get a palindrome (3423333243).

The spelling of 2212121121 in words is "two billion, two hundred twelve million, one hundred twenty-one thousand, one hundred twenty-one".