223321220021 has 8 divisors (see below), whose sum is σ = 225579169080. Its totient is φ = 221073847488.

The previous prime is 223321220011. The next prime is 223321220029. The reversal of 223321220021 is 120022123322.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2689978225 + 220631241796 = 51865^2 + 469714^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 223321220021 - 2¹⁰ = 223321218997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223321219975 and 223321220002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223321220029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2601686 + ... + 2686151.

It is an arithmetic number, because the mean of its divisors is an integer number (28197396135).

Almost surely, 2^223321220021 is an apocalyptic number.

It is an amenable number.

223321220021 is a deficient number, since it is larger than the sum of its proper divisors (2257949059).

223321220021 is a wasteful number, since it uses less digits than its factorization.

223321220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5288263.

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

Adding to 223321220021 its reverse (120022123322), we get a palindrome (343343343343).

The spelling of 223321220021 in words is "two hundred twenty-three billion, three hundred twenty-one million, two hundred twenty thousand, twenty-one".