2011222201221 has 6 divisors (see below), whose sum is σ = 2905098735110. Its totient is φ = 1340814800808.

The previous prime is 2011222201211. The next prime is 2011222201223. The reversal of 2011222201221 is 1221022221102.

It is a happy number.

2011222201221 is a `hidden beast` number, since 20 + 1 + 1 + 222 + 201 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1971974232900 + 39247968321 = 1404270^2 + 198111^2 .

It is not a de Polignac number, because 2011222201221 - 2³⁵ = 1976862462853 is a prime.

It is a super-2 number, since 2×2011222201221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2011222201194 and 2011222201203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011222201223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111734566726 + ... + 111734566743.

Almost surely, 2^{2011222201221} is an apocalyptic number.

It is an amenable number.

2011222201221 is a deficient number, since it is larger than the sum of its proper divisors (893876533889).

2011222201221 is a wasteful number, since it uses less digits than its factorization.

2011222201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223469133475 (or 223469133472 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2011222201221 its reverse (1221022221102), we get a palindrome (3232244422323).

The spelling of 2011222201221 in words is "two trillion, eleven billion, two hundred twenty-two million, two hundred one thousand, two hundred twenty-one".