221311112333221 has 4 divisors (see below), whose sum is σ = 223341489510700. Its totient is φ = 219280735155744.

The previous prime is 221311112333219. The next prime is 221311112333237. The reversal of 221311112333221 is 122333211113122.

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 200460573728100 + 20850538605121 = 14158410^2 + 4566239^2 .

It is a cyclic number.

It is not a de Polignac number, because 221311112333221 - 2¹ = 221311112333219 is a prime.

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 221311112333221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221311112333261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1015188588576 + ... + 1015188588793.

It is an arithmetic number, because the mean of its divisors is an integer number (55835372377675).

Almost surely, 2^{221311112333221} is an apocalyptic number.

It is an amenable number.

221311112333221 is a deficient number, since it is larger than the sum of its proper divisors (2030377177479).

221311112333221 is a wasteful number, since it uses less digits than its factorization.

221311112333221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030377177478.

The product of its digits is 2592, while the sum is 28.

Adding to 221311112333221 its reverse (122333211113122), we get a palindrome (343644323446343).

The spelling of 221311112333221 in words is "two hundred twenty-one trillion, three hundred eleven billion, one hundred twelve million, three hundred thirty-three thousand, two hundred twenty-one".