2122202112221 has 4 divisors (see below), whose sum is σ = 2156992310844. Its totient is φ = 2087411913600.

The previous prime is 2122202112187. The next prime is 2122202112223. The reversal of 2122202112221 is 1222112022212.

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 305405443225 + 1816796668996 = 552635^2 + 1347886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2122202112221 is a prime.

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 = 2122202112193 and 2122202112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122202112223) 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, 17395099220 + ... + 17395099341.

It is an arithmetic number, because the mean of its divisors is an integer number (539248077711).

Almost surely, 2^{2122202112221} is an apocalyptic number.

It is an amenable number.

2122202112221 is a deficient number, since it is larger than the sum of its proper divisors (34790198623).

2122202112221 is an equidigital number, since it uses as much as digits as its factorization.

2122202112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34790198622.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2122202112221 its reverse (1222112022212), we get a palindrome (3344314134433).

Subtracting from 2122202112221 its reverse (1222112022212), we obtain a palindrome (900090090009).

The spelling of 2122202112221 in words is "two trillion, one hundred twenty-two billion, two hundred two million, one hundred twelve thousand, two hundred twenty-one".