221303122221 has 4 divisors (see below), whose sum is σ = 295070829632. Its totient is φ = 147535414812.

The previous prime is 221303122219. The next prime is 221303122237. The reversal of 221303122221 is 122221303122.

221303122221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 221303122221 - 2¹ = 221303122219 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 (221303122211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36883853701 + ... + 36883853706.

It is an arithmetic number, because the mean of its divisors is an integer number (73767707408).

Almost surely, 2^221303122221 is an apocalyptic number.

It is an amenable number.

221303122221 is a deficient number, since it is larger than the sum of its proper divisors (73767707411).

221303122221 is an equidigital number, since it uses as much as digits as its factorization.

221303122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73767707410.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 221303122221 its reverse (122221303122), we get a palindrome (343524425343).

The spelling of 221303122221 in words is "two hundred twenty-one billion, three hundred three million, one hundred twenty-two thousand, two hundred twenty-one".