2012121221 has 12 divisors (see below), whose sum is σ = 2212847616. Its totient is φ = 1828227720.

The previous prime is 2012121179. The next prime is 2012121229. The reversal of 2012121221 is 1221212102.

It is not a de Polignac number, because 2012121221 - 2⁶ = 2012121157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012121196 and 2012121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012121229) 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 11 ways as a sum of consecutive naturals, for example, 324476 + ... + 330618.

It is an arithmetic number, because the mean of its divisors is an integer number (184403968).

Almost surely, 2^2012121221 is an apocalyptic number.

It is an amenable number.

2012121221 is a deficient number, since it is larger than the sum of its proper divisors (200726395).

2012121221 is a wasteful number, since it uses less digits than its factorization.

2012121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8872 (or 8861 counting only the distinct ones).

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

The square root of 2012121221 is about 44856.6742079704. The cubic root of 2012121221 is about 1262.4612220354.

Adding to 2012121221 its reverse (1221212102), we get a palindrome (3233333323).

The spelling of 2012121221 in words is "two billion, twelve million, one hundred twenty-one thousand, two hundred twenty-one".