20404303221 has 4 divisors (see below), whose sum is σ = 27205737632. Its totient is φ = 13602868812.

The previous prime is 20404303189. The next prime is 20404303223. The reversal of 20404303221 is 12230340402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20404303221 - 2⁵ = 20404303189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404303223) 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, 3400717201 + ... + 3400717206.

It is an arithmetic number, because the mean of its divisors is an integer number (6801434408).

Almost surely, 2^20404303221 is an apocalyptic number.

It is an amenable number.

20404303221 is a deficient number, since it is larger than the sum of its proper divisors (6801434411).

20404303221 is an equidigital number, since it uses as much as digits as its factorization.

20404303221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6801434410.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20404303221 its reverse (12230340402), we get a palindrome (32634643623).

The spelling of 20404303221 in words is "twenty billion, four hundred four million, three hundred three thousand, two hundred twenty-one".