21200032320 has 56 divisors (see below), whose sum is σ = 67310105664. Its totient is φ = 5653341696.

The previous prime is 21200032297. The next prime is 21200032333. The reversal of 21200032320 is 2323000212.

It is a super-3 number, since 3×21200032320³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21200032320.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11040724 + ... + 11042643.

Almost surely, 2^21200032320 is an apocalyptic number.

21200032320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200032320 is an abundant number, since it is smaller than the sum of its proper divisors (46110073344).

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

21200032320 is a wasteful number, since it uses less digits than its factorization.

21200032320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22083387 (or 22083377 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 21200032320 its reverse (2323000212), we get a palindrome (23523032532).

The spelling of 21200032320 in words is "twenty-one billion, two hundred million, thirty-two thousand, three hundred twenty".