2211020201221 has 96 divisors (see below), whose sum is σ = 2559069162720. Its totient is φ = 1897426944000.

The previous prime is 2211020201213. The next prime is 2211020201233. The reversal of 2211020201221 is 1221020201122.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 249230592900 + 1961789608321 = 499230^2 + 1400639^2 .

It is not a de Polignac number, because 2211020201221 - 2³ = 2211020201213 is a prime.

It is a super-2 number, since 2×2211020201221² (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 = 2211020201195 and 2211020201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211020201281) 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 95 ways as a sum of consecutive naturals, for example, 9655109935 + ... + 9655110163.

It is an arithmetic number, because the mean of its divisors is an integer number (26656970445).

Almost surely, 2^{2211020201221} is an apocalyptic number.

It is an amenable number.

2211020201221 is a deficient number, since it is larger than the sum of its proper divisors (348048961499).

2211020201221 is a wasteful number, since it uses less digits than its factorization.

2211020201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2211020201221 its reverse (1221020201122), we get a palindrome (3432040402343).

Subtracting from 2211020201221 its reverse (1221020201122), we obtain a palindrome (990000000099).

The spelling of 2211020201221 in words is "two trillion, two hundred eleven billion, twenty million, two hundred one thousand, two hundred twenty-one".