21232330320 has 160 divisors (see below), whose sum is σ = 66949857792. Its totient is φ = 5565321216.

The previous prime is 21232330313. The next prime is 21232330321. The reversal of 21232330320 is 2303323212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232330321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5551929 + ... + 5555751.

Almost surely, 2^21232330320 is an apocalyptic number.

21232330320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21232330320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33474928896).

21232330320 is an abundant number, since it is smaller than the sum of its proper divisors (45717527472).

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

21232330320 is a wasteful number, since it uses less digits than its factorization.

21232330320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4229 (or 4223 counting only the distinct ones).

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

Adding to 21232330320 its reverse (2303323212), we get a palindrome (23535653532).

The spelling of 21232330320 in words is "twenty-one billion, two hundred thirty-two million, three hundred thirty thousand, three hundred twenty".