21500325303 has 4 divisors (see below), whose sum is σ = 28667100408. Its totient is φ = 14333550200.

The previous prime is 21500325281. The next prime is 21500325337. The reversal of 21500325303 is 30352300512.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21500325303 - 2¹⁴ = 21500308919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500325703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3583387548 + ... + 3583387553.

It is an arithmetic number, because the mean of its divisors is an integer number (7166775102).

Almost surely, 2^21500325303 is an apocalyptic number.

21500325303 is a deficient number, since it is larger than the sum of its proper divisors (7166775105).

21500325303 is an equidigital number, since it uses as much as digits as its factorization.

21500325303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7166775104.

The product of its (nonzero) digits is 2700, while the sum is 24.

Adding to 21500325303 its reverse (30352300512), we get a palindrome (51852625815).

The spelling of 21500325303 in words is "twenty-one billion, five hundred million, three hundred twenty-five thousand, three hundred three".