2201221222021 has 4 divisors (see below), whose sum is σ = 2201402300332. Its totient is φ = 2201040143712.

The previous prime is 2201221222019. The next prime is 2201221222043. The reversal of 2201221222021 is 1202221221022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1292964571396 + 908256650625 = 1137086^2 + 953025^2 .

It is a cyclic number.

It is not a de Polignac number, because 2201221222021 - 2¹ = 2201221222019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2201221222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201221222061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90520920 + ... + 90545233.

It is an arithmetic number, because the mean of its divisors is an integer number (550350575083).

Almost surely, 2^{2201221222021} is an apocalyptic number.

It is an amenable number.

2201221222021 is a deficient number, since it is larger than the sum of its proper divisors (181078311).

2201221222021 is a wasteful number, since it uses less digits than its factorization.

2201221222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181078310.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 2201221222021 its reverse (1202221221022), we get a palindrome (3403442443043).

Subtracting from 2201221222021 its reverse (1202221221022), we obtain a palindrome (999000000999).

It can be divided in two parts, 2201221 and 222021, that added together give a palindrome (2423242).

The spelling of 2201221222021 in words is "two trillion, two hundred one billion, two hundred twenty-one million, two hundred twenty-two thousand, twenty-one".