2012321212221 has 32 divisors (see below), whose sum is σ = 2933420617728. Its totient is φ = 1221547057920.

The previous prime is 2012321212201. The next prime is 2012321212247. The reversal of 2012321212221 is 1222121232102.

It is not a de Polignac number, because 2012321212221 - 2³⁵ = 1977961473853 is a prime.

It is a super-2 number, since 2×2012321212221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012321212201) 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 31 ways as a sum of consecutive naturals, for example, 5297766 + ... + 5664888.

It is an arithmetic number, because the mean of its divisors is an integer number (91669394304).

Almost surely, 2^{2012321212221} is an apocalyptic number.

It is an amenable number.

2012321212221 is a deficient number, since it is larger than the sum of its proper divisors (921099405507).

2012321212221 is a wasteful number, since it uses less digits than its factorization.

2012321212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370641.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 2012321212221 its reverse (1222121232102), we get a palindrome (3234442444323).

The spelling of 2012321212221 in words is "two trillion, twelve billion, three hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".