2112220020221 has 4 divisors (see below), whose sum is σ = 2113014987132. Its totient is φ = 2111425053312.

The previous prime is 2112220020133. The next prime is 2112220020223. The reversal of 2112220020221 is 1220200222112.

It is a happy number.

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 1783960922500 + 328259097721 = 1335650^2 + 572939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2112220020221 is a prime.

It is a super-2 number, since 2×2112220020221² (a number of 25 digits) contains 22 as substring.

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 2112220020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112220020223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397479470 + ... + 397484783.

It is an arithmetic number, because the mean of its divisors is an integer number (528253746783).

Almost surely, 2^{2112220020221} is an apocalyptic number.

It is an amenable number.

2112220020221 is a deficient number, since it is larger than the sum of its proper divisors (794966911).

2112220020221 is an equidigital number, since it uses as much as digits as its factorization.

2112220020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794966910.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2112220020221 its reverse (1220200222112), we get a palindrome (3332420242333).

The spelling of 2112220020221 in words is "two trillion, one hundred twelve billion, two hundred twenty million, twenty thousand, two hundred twenty-one".