2212012121 has 4 divisors (see below), whose sum is σ = 2413104144. Its totient is φ = 2010920100.

The previous prime is 2212012111. The next prime is 2212012123. The reversal of 2212012121 is 1212102122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2212012121 - 2¹⁸ = 2211749977 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2212012096 and 2212012105.

It is not an unprimeable number, because it can be changed into a prime (2212012123) 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 3 ways as a sum of consecutive naturals, for example, 100545995 + ... + 100546016.

It is an arithmetic number, because the mean of its divisors is an integer number (603276036).

Almost surely, 2^2212012121 is an apocalyptic number.

It is an amenable number.

2212012121 is a deficient number, since it is larger than the sum of its proper divisors (201092023).

2212012121 is a wasteful number, since it uses less digits than its factorization.

2212012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201092022.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2212012121 is about 47032.0329243804. The cubic root of 2212012121 is about 1302.9542519838.

Adding to 2212012121 its reverse (1212102122), we get a palindrome (3424114243).

Subtracting from 2212012121 its reverse (1212102122), we obtain a palindrome (999909999).

It can be divided in two parts, 221201 and 2121, that added together give a palindrome (223322).

The spelling of 2212012121 in words is "two billion, two hundred twelve million, twelve thousand, one hundred twenty-one".