221221205345323 has 4 divisors (see below), whose sum is σ = 221221452862728. Its totient is φ = 221220957827920.

The previous prime is 221221205345317. The next prime is 221221205345341. The reversal of 221221205345323 is 323543502122122.

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-221221205345323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221221205345123) 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, 122413186 + ... + 124207207.

It is an arithmetic number, because the mean of its divisors is an integer number (55305363215682).

Almost surely, 2^{221221205345323} is an apocalyptic number.

221221205345323 is a deficient number, since it is larger than the sum of its proper divisors (247517405).

221221205345323 is an equidigital number, since it uses as much as digits as its factorization.

221221205345323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247517404.

The product of its (nonzero) digits is 172800, while the sum is 37.

Adding to 221221205345323 its reverse (323543502122122), we get a palindrome (544764707467445).

The spelling of 221221205345323 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred five million, three hundred forty-five thousand, three hundred twenty-three".