21320322303 has 16 divisors (see below), whose sum is σ = 32496988160. Its totient is φ = 12179712096.

The previous prime is 21320322277. The next prime is 21320322311. The reversal of 21320322303 is 30322302312.

It is not a de Polignac number, because 21320322303 - 2²⁸ = 21051886847 is a prime.

It is a super-3 number, since 3×21320322303³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21320322303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320322203) 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, 58975 + ... + 214752.

It is an arithmetic number, because the mean of its divisors is an integer number (2031061760).

Almost surely, 2^21320322303 is an apocalyptic number.

21320322303 is a deficient number, since it is larger than the sum of its proper divisors (11176665857).

21320322303 is a wasteful number, since it uses less digits than its factorization.

21320322303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277446.

The product of its (nonzero) digits is 1296, while the sum is 21.

Adding to 21320322303 its reverse (30322302312), we get a palindrome (51642624615).

The spelling of 21320322303 in words is "twenty-one billion, three hundred twenty million, three hundred twenty-two thousand, three hundred three".