221243323342121 has 4 divisors (see below), whose sum is σ = 232887708781200. Its totient is φ = 209598937903044.

The previous prime is 221243323342117. The next prime is 221243323342193. The reversal of 221243323342121 is 121243323342122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221243323342121 - 2² = 221243323342117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221243323342021) by changing a digit.

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, 5822192719511 + ... + 5822192719548.

It is an arithmetic number, because the mean of its divisors is an integer number (58221927195300).

Almost surely, 2^{221243323342121} is an apocalyptic number.

It is an amenable number.

221243323342121 is a deficient number, since it is larger than the sum of its proper divisors (11644385439079).

221243323342121 is a wasteful number, since it uses less digits than its factorization.

221243323342121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11644385439078.

The product of its digits is 82944, while the sum is 35.

Adding to 221243323342121 its reverse (121243323342122), we get a palindrome (342486646684243).

Subtracting from 221243323342121 its reverse (121243323342122), we obtain a palindrome (99999999999999).

The spelling of 221243323342121 in words is "two hundred twenty-one trillion, two hundred forty-three billion, three hundred twenty-three million, three hundred forty-two thousand, one hundred twenty-one".