21320202320 has 40 divisors (see below), whose sum is σ = 49575637224. Its totient is φ = 8527020032.

The previous prime is 21320202317. The next prime is 21320202329. The reversal of 21320202320 is 2320202312.

It can be written as a sum of positive squares in 4 ways, for example, as 655564816 + 20664637504 = 25604^2 + 143752^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320202329) 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, 1086032 + ... + 1105488.

Almost surely, 2^21320202320 is an apocalyptic number.

21320202320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21320202320 is an abundant number, since it is smaller than the sum of its proper divisors (28255434904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21320202320 is a wasteful number, since it uses less digits than its factorization.

21320202320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33167 (or 33161 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21320202320 its reverse (2320202312), we get a palindrome (23640404632).

The spelling of 21320202320 in words is "twenty-one billion, three hundred twenty million, two hundred two thousand, three hundred twenty".