20104400321 has 4 divisors (see below), whose sum is σ = 20104719444. Its totient is φ = 20104081200.

The previous prime is 20104400293. The next prime is 20104400339. The reversal of 20104400321 is 12300440102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6342529600 + 13761870721 = 79640^2 + 117311^2 .

It is a cyclic number.

It is not a de Polignac number, because 20104400321 - 2²² = 20100206017 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 20104400321.

It is not an unprimeable number, because it can be changed into a prime (20104400341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29990 + ... + 202751.

It is an arithmetic number, because the mean of its divisors is an integer number (5026179861).

Almost surely, 2^20104400321 is an apocalyptic number.

It is an amenable number.

20104400321 is a deficient number, since it is larger than the sum of its proper divisors (319123).

20104400321 is an equidigital number, since it uses as much as digits as its factorization.

20104400321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319122.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20104400321 its reverse (12300440102), we get a palindrome (32404840423).

The spelling of 20104400321 in words is "twenty billion, one hundred four million, four hundred thousand, three hundred twenty-one".