21320133303 has 16 divisors (see below), whose sum is σ = 33365872640. Its totient is φ = 11853664416.

The previous prime is 21320133293. The next prime is 21320133311. The reversal of 21320133303 is 30333102312.

It is not a de Polignac number, because 21320133303 - 2⁵ = 21320133271 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21320133303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320133103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13718743 + ... + 13720296.

It is an arithmetic number, because the mean of its divisors is an integer number (2085367040).

Almost surely, 2^21320133303 is an apocalyptic number.

21320133303 is a deficient number, since it is larger than the sum of its proper divisors (12045739337).

21320133303 is a wasteful number, since it uses less digits than its factorization.

21320133303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27439086.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 21320133303 its reverse (30333102312), we get a palindrome (51653235615).

The spelling of 21320133303 in words is "twenty-one billion, three hundred twenty million, one hundred thirty-three thousand, three hundred three".