221221303311 has 4 divisors (see below), whose sum is σ = 294961737752. Its totient is φ = 147480868872.

The previous prime is 221221303307. The next prime is 221221303319. The reversal of 221221303311 is 113303122122.

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

It is not a de Polignac number, because 221221303311 - 2² = 221221303307 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 (221221303319) 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, 36870217216 + ... + 36870217221.

It is an arithmetic number, because the mean of its divisors is an integer number (73740434438).

Almost surely, 2^221221303311 is an apocalyptic number.

221221303311 is a deficient number, since it is larger than the sum of its proper divisors (73740434441).

221221303311 is an equidigital number, since it uses as much as digits as its factorization.

221221303311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73740434440.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 221221303311 its reverse (113303122122), we get a palindrome (334524425433).

The spelling of 221221303311 in words is "two hundred twenty-one billion, two hundred twenty-one million, three hundred three thousand, three hundred eleven".