223320212121 has 4 divisors (see below), whose sum is σ = 297760282832. Its totient is φ = 148880141412.

The previous prime is 223320212111. The next prime is 223320212149. The reversal of 223320212121 is 121212023322.

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 223320212121 - 2⁶ = 223320212057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223320212111) 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, 37220035351 + ... + 37220035356.

It is an arithmetic number, because the mean of its divisors is an integer number (74440070708).

Almost surely, 2^223320212121 is an apocalyptic number.

It is an amenable number.

223320212121 is a deficient number, since it is larger than the sum of its proper divisors (74440070711).

223320212121 is an equidigital number, since it uses as much as digits as its factorization.

223320212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74440070710.

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

Adding to 223320212121 its reverse (121212023322), we get a palindrome (344532235443).

The spelling of 223320212121 in words is "two hundred twenty-three billion, three hundred twenty million, two hundred twelve thousand, one hundred twenty-one".