221223322121 has 4 divisors (see below), whose sum is σ = 221230374144. Its totient is φ = 221216270100.

The previous prime is 221223322109. The next prime is 221223322141. The reversal of 221223322121 is 121223322122.

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 221223322121 - 2¹⁰ = 221223321097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221223322141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3478745 + ... + 3541766.

It is an arithmetic number, because the mean of its divisors is an integer number (55307593536).

Almost surely, 2^221223322121 is an apocalyptic number.

It is an amenable number.

221223322121 is a deficient number, since it is larger than the sum of its proper divisors (7052023).

221223322121 is an equidigital number, since it uses as much as digits as its factorization.

221223322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7052022.

The product of its digits is 1152, while the sum is 23.

Adding to 221223322121 its reverse (121223322122), we get a palindrome (342446644243).

Subtracting from 221223322121 its reverse (121223322122), we obtain a palindrome (99999999999).

The spelling of 221223322121 in words is "two hundred twenty-one billion, two hundred twenty-three million, three hundred twenty-two thousand, one hundred twenty-one".