221343242231311 has 4 divisors (see below), whose sum is σ = 221356754441224. Its totient is φ = 221329730021400.

The previous prime is 221343242231291. The next prime is 221343242231359. The reversal of 221343242231311 is 113132242343122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221343242231311 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 (221343242231711) 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, 6756080385 + ... + 6756113146.

It is an arithmetic number, because the mean of its divisors is an integer number (55339188610306).

Almost surely, 2^{221343242231311} is an apocalyptic number.

221343242231311 is a deficient number, since it is larger than the sum of its proper divisors (13512209913).

221343242231311 is a wasteful number, since it uses less digits than its factorization.

221343242231311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13512209912.

The product of its digits is 41472, while the sum is 34.

Adding to 221343242231311 its reverse (113132242343122), we get a palindrome (334475484574433).

The spelling of 221343242231311 in words is "two hundred twenty-one trillion, three hundred forty-three billion, two hundred forty-two million, two hundred thirty-one thousand, three hundred eleven".