2122020211221 has 6 divisors (see below), whose sum is σ = 3065140305110. Its totient is φ = 1414680140808.

The previous prime is 2122020211211. The next prime is 2122020211243. The reversal of 2122020211221 is 1221120202212.

It is a happy number.

2122020211221 is a `hidden beast` number, since 21 + 220 + 202 + 1 + 1 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1785927540996 + 336092670225 = 1336386^2 + 579735^2 .

It is not a de Polignac number, because 2122020211221 - 2³¹ = 2119872727573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2122020211194 and 2122020211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122020211211) 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, 117890011726 + ... + 117890011743.

Almost surely, 2^{2122020211221} is an apocalyptic number.

It is an amenable number.

2122020211221 is a deficient number, since it is larger than the sum of its proper divisors (943120093889).

2122020211221 is a wasteful number, since it uses less digits than its factorization.

2122020211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235780023475 (or 235780023472 counting only the distinct ones).

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

Adding to 2122020211221 its reverse (1221120202212), we get a palindrome (3343140413433).

Subtracting from 2122020211221 its reverse (1221120202212), we obtain a palindrome (900900009009).

The spelling of 2122020211221 in words is "two trillion, one hundred twenty-two billion, twenty million, two hundred eleven thousand, two hundred twenty-one".