2201122121021 has 4 divisors (see below), whose sum is σ = 2242652727132. Its totient is φ = 2159591514912.

The previous prime is 2201122120903. The next prime is 2201122121047. The reversal of 2201122121021 is 1201212211022.

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 784843615396 + 1416278505625 = 885914^2 + 1190075^2 .

It is a cyclic number.

It is not a de Polignac number, because 2201122121021 - 2²⁶ = 2201055012157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201122121071) 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, 20765302976 + ... + 20765303081.

It is an arithmetic number, because the mean of its divisors is an integer number (560663181783).

Almost surely, 2^{2201122121021} is an apocalyptic number.

It is an amenable number.

2201122121021 is a deficient number, since it is larger than the sum of its proper divisors (41530606111).

2201122121021 is an equidigital number, since it uses as much as digits as its factorization.

2201122121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41530606110.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2201122121021 its reverse (1201212211022), we get a palindrome (3402334332043).

Subtracting from 2201122121021 its reverse (1201212211022), we obtain a palindrome (999909909999).

The spelling of 2201122121021 in words is "two trillion, two hundred one billion, one hundred twenty-two million, one hundred twenty-one thousand, twenty-one".