404223121421 has 16 divisors (see below), whose sum is σ = 466929840384. Its totient is φ = 342773810304.

The previous prime is 404223121403. The next prime is 404223121447. The reversal of 404223121421 is 124121322404.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404223121421 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404223121121) 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 in 15 ways as a sum of consecutive naturals, for example, 438305 + ... + 1000278.

It is an arithmetic number, because the mean of its divisors is an integer number (29183115024).

Almost surely, 2^404223121421 is an apocalyptic number.

It is an amenable number.

404223121421 is a deficient number, since it is larger than the sum of its proper divisors (62706718963).

404223121421 is a wasteful number, since it uses less digits than its factorization.

404223121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439020.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 404223121421 its reverse (124121322404), we get a palindrome (528344443825).

The spelling of 404223121421 in words is "four hundred four billion, two hundred twenty-three million, one hundred twenty-one thousand, four hundred twenty-one".