2012122111221 has 12 divisors (see below), whose sum is σ = 2906443202572. Its totient is φ = 1341394157376.

The previous prime is 2012122111211. The next prime is 2012122111229. The reversal of 2012122111221 is 1221112212102.

2012122111221 is a `hidden beast` number, since 20 + 1 + 212 + 211 + 1 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 860514114321 + 1151607996900 = 927639^2 + 1073130^2 .

It is not a de Polignac number, because 2012122111221 - 2⁶ = 2012122111157 is a prime.

It is a super-2 number, since 2×2012122111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012122111194 and 2012122111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012122111229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1083946 + ... + 2280171.

Almost surely, 2^{2012122111221} is an apocalyptic number.

It is an amenable number.

2012122111221 is a deficient number, since it is larger than the sum of its proper divisors (894321091351).

2012122111221 is a wasteful number, since it uses less digits than its factorization.

2012122111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3430580 (or 3430577 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 2012122111221 its reverse (1221112212102), we get a palindrome (3233234323323).

The spelling of 2012122111221 in words is "two trillion, twelve billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".