2221021243255 has 4 divisors (see below), whose sum is σ = 2665225491912. Its totient is φ = 1776816994600.

The previous prime is 2221021243247. The next prime is 2221021243289. The reversal of 2221021243255 is 5523421201222.

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

It is not a de Polignac number, because 2221021243255 - 2³ = 2221021243247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222102124321 + ... + 222102124330.

It is an arithmetic number, because the mean of its divisors is an integer number (666306372978).

Almost surely, 2^{2221021243255} is an apocalyptic number.

2221021243255 is a deficient number, since it is larger than the sum of its proper divisors (444204248657).

2221021243255 is an equidigital number, since it uses as much as digits as its factorization.

2221021243255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444204248656.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 2221021243255 its reverse (5523421201222), we get a palindrome (7744442444477).

The spelling of 2221021243255 in words is "two trillion, two hundred twenty-one billion, twenty-one million, two hundred forty-three thousand, two hundred fifty-five".