221211444323 has 4 divisors (see below), whose sum is σ = 221993110488. Its totient is φ = 220429778160.

The previous prime is 221211444319. The next prime is 221211444329. The reversal of 221211444323 is 323444112122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 323444112122 = 2 ⋅161722056061.

It is a cyclic number.

It is not a de Polignac number, because 221211444323 - 2² = 221211444319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221211444329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390832658 + ... + 390833223.

It is an arithmetic number, because the mean of its divisors is an integer number (55498277622).

Almost surely, 2^221211444323 is an apocalyptic number.

221211444323 is a deficient number, since it is larger than the sum of its proper divisors (781666165).

221211444323 is an equidigital number, since it uses as much as digits as its factorization.

221211444323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781666164.

The product of its digits is 9216, while the sum is 29.

Adding to 221211444323 its reverse (323444112122), we get a palindrome (544655556445).

The spelling of 221211444323 in words is "two hundred twenty-one billion, two hundred eleven million, four hundred forty-four thousand, three hundred twenty-three".