21303110221 has 8 divisors (see below), whose sum is σ = 21764567160. Its totient is φ = 20846588928.

The previous prime is 21303110219. The next prime is 21303110237. The reversal of 21303110221 is 12201130312.

It can be written as a sum of positive squares in 4 ways, for example, as 20385225 + 21282724996 = 4515^2 + 145886^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21303110221 - 2¹ = 21303110219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21303110195 and 21303110204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303110291) 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 7 ways as a sum of consecutive naturals, for example, 1225186 + ... + 1242451.

It is an arithmetic number, because the mean of its divisors is an integer number (2720570895).

Almost surely, 2^21303110221 is an apocalyptic number.

It is an amenable number.

21303110221 is a deficient number, since it is larger than the sum of its proper divisors (461456939).

21303110221 is an equidigital number, since it uses as much as digits as its factorization.

21303110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2467823.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21303110221 its reverse (12201130312), we get a palindrome (33504240533).

The spelling of 21303110221 in words is "twenty-one billion, three hundred three million, one hundred ten thousand, two hundred twenty-one".