404223111221 has 2 divisors, whose sum is σ = 404223111222. Its totient is φ = 404223111220.

The previous prime is 404223111151. The next prime is 404223111223. The reversal of 404223111221 is 122111322404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 356617980625 + 47605130596 = 597175^2 + 218186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404223111221 is a prime.

It is a super-2 number, since 2×404223111221² (a number of 24 digits) contains 22 as substring.

Together with 404223111223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404223111223) 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 as a sum of consecutive naturals, namely, 202111555610 + 202111555611.

It is an arithmetic number, because the mean of its divisors is an integer number (202111555611).

Almost surely, 2^404223111221 is an apocalyptic number.

It is an amenable number.

404223111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

404223111221 is an equidigital number, since it uses as much as digits as its factorization.

404223111221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 404223111221 its reverse (122111322404), we get a palindrome (526334433625).

The spelling of 404223111221 in words is "four hundred four billion, two hundred twenty-three million, one hundred eleven thousand, two hundred twenty-one".