21420323303 has 8 divisors (see below), whose sum is σ = 22682728320. Its totient is φ = 20171420280.

The previous prime is 21420323297. The next prime is 21420323311. The reversal of 21420323303 is 30332302412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21420323303 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 (21420323503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3372233 + ... + 3378578.

It is an arithmetic number, because the mean of its divisors is an integer number (2835341040).

Almost surely, 2^21420323303 is an apocalyptic number.

21420323303 is a deficient number, since it is larger than the sum of its proper divisors (1262405017).

21420323303 is a wasteful number, since it uses less digits than its factorization.

21420323303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6750997.

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 21420323303 its reverse (30332302412), we get a palindrome (51752625715).

The spelling of 21420323303 in words is "twenty-one billion, four hundred twenty million, three hundred twenty-three thousand, three hundred three".