21000346303 has 4 divisors (see below), whose sum is σ = 21003705648. Its totient is φ = 20996986960.

The previous prime is 21000346273. The next prime is 21000346309. The reversal of 21000346303 is 30364300012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000346303 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 (21000346309) 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, 1670278 + ... + 1682803.

It is an arithmetic number, because the mean of its divisors is an integer number (5250926412).

Almost surely, 2^21000346303 is an apocalyptic number.

21000346303 is a deficient number, since it is larger than the sum of its proper divisors (3359345).

21000346303 is an equidigital number, since it uses as much as digits as its factorization.

21000346303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3359344.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21000346303 its reverse (30364300012), we get a palindrome (51364646315).

The spelling of 21000346303 in words is "twenty-one billion, three hundred forty-six thousand, three hundred three".