221223012404 has 12 divisors (see below), whose sum is σ = 387157001700. Its totient is φ = 110606726208.

The previous prime is 221223012359. The next prime is 221223012419. The reversal of 221223012404 is 404210322122.

It can be written as a sum of positive squares in 2 ways, for example, as 133808176804 + 87414835600 = 365798^2 + 295660^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221223012404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1089839 + ... + 1276790.

It is an arithmetic number, because the mean of its divisors is an integer number (32263083475).

Almost surely, 2^221223012404 is an apocalyptic number.

It is an amenable number.

221223012404 is a deficient number, since it is larger than the sum of its proper divisors (165933989296).

221223012404 is a wasteful number, since it uses less digits than its factorization.

221223012404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390002 (or 2390000 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 221223012404 its reverse (404210322122), we get a palindrome (625433334526).

The spelling of 221223012404 in words is "two hundred twenty-one billion, two hundred twenty-three million, twelve thousand, four hundred four".