104400821 has 12 divisors (see below), whose sum is σ = 121784832. Its totient is φ = 89236728.

The previous prime is 104400817. The next prime is 104400833. The reversal of 104400821 is 128004401.

It is not a de Polignac number, because 104400821 - 2² = 104400817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 104400793 and 104400802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (104400851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15986 + ... + 21548.

It is an arithmetic number, because the mean of its divisors is an integer number (10148736).

Almost surely, 2^104400821 is an apocalyptic number.

It is an amenable number.

104400821 is a deficient number, since it is larger than the sum of its proper divisors (17384011).

104400821 is an equidigital number, since it uses as much as digits as its factorization.

104400821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5960 (or 5953 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 104400821 is about 10217.6719951269. The cubic root of 104400821 is about 470.8703068641.

The spelling of 104400821 in words is "one hundred four million, four hundred thousand, eight hundred twenty-one".