221303022221 has 4 divisors (see below), whose sum is σ = 221971611744. Its totient is φ = 220634432700.

The previous prime is 221303022203. The next prime is 221303022251. The reversal of 221303022221 is 122220303122.

It is a happy number.

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 221303022221 - 2²⁶ = 221235913357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221303022193 and 221303022202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221303022251) 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, 334294265 + ... + 334294926.

It is an arithmetic number, because the mean of its divisors is an integer number (55492902936).

Almost surely, 2^221303022221 is an apocalyptic number.

It is an amenable number.

221303022221 is a deficient number, since it is larger than the sum of its proper divisors (668589523).

221303022221 is an equidigital number, since it uses as much as digits as its factorization.

221303022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668589522.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 221303022221 its reverse (122220303122), we get a palindrome (343523325343).

The spelling of 221303022221 in words is "two hundred twenty-one billion, three hundred three million, twenty-two thousand, two hundred twenty-one".