2211220220221 has 4 divisors (see below), whose sum is σ = 2217781704892. Its totient is φ = 2204658735552.

The previous prime is 2211220220171. The next prime is 2211220220281. The reversal of 2211220220221 is 1220220221122.

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 281760317721 + 1929459902500 = 530811^2 + 1389050^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211220220221 - 2¹¹ = 2211220218173 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 (2211220220281) 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, 3280741830 + ... + 3280742503.

It is an arithmetic number, because the mean of its divisors is an integer number (554445426223).

Almost surely, 2^{2211220220221} is an apocalyptic number.

It is an amenable number.

2211220220221 is a deficient number, since it is larger than the sum of its proper divisors (6561484671).

2211220220221 is an equidigital number, since it uses as much as digits as its factorization.

2211220220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6561484670.

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

Adding to 2211220220221 its reverse (1220220221122), we get a palindrome (3431440441343).

Subtracting from 2211220220221 its reverse (1220220221122), we obtain a palindrome (990999999099).

The spelling of 2211220220221 in words is "two trillion, two hundred eleven billion, two hundred twenty million, two hundred twenty thousand, two hundred twenty-one".