404505112100221 has 16 divisors (see below), whose sum is σ = 442953391104000. Its totient is φ = 366336228139200.

The previous prime is 404505112100183. The next prime is 404505112100233. The reversal of 404505112100221 is 122001211505404.

It is not a de Polignac number, because 404505112100221 - 2⁹ = 404505112099709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 404505112100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404505112100321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32531851 + ... + 43212631.

It is an arithmetic number, because the mean of its divisors is an integer number (27684586944000).

Almost surely, 2^{404505112100221} is an apocalyptic number.

It is an amenable number.

404505112100221 is a deficient number, since it is larger than the sum of its proper divisors (38448279003779).

404505112100221 is a wasteful number, since it uses less digits than its factorization.

404505112100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10693860.

The product of its (nonzero) digits is 3200, while the sum is 28.

Adding to 404505112100221 its reverse (122001211505404), we get a palindrome (526506323605625).

The spelling of 404505112100221 in words is "four hundred four trillion, five hundred five billion, one hundred twelve million, one hundred thousand, two hundred twenty-one".