21230232320 has 144 divisors (see below), whose sum is σ = 56029065120. Its totient is φ = 7643136000.

The previous prime is 21230232311. The next prime is 21230232323. The reversal of 21230232320 is 2323203212.

It is a super-2 number, since 2×21230232320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21230232292 and 21230232301.

It is not an unprimeable number, because it can be changed into a prime (21230232323) 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, 1414616 + ... + 1429544.

It is an arithmetic number, because the mean of its divisors is an integer number (389090730).

Almost surely, 2^21230232320 is an apocalyptic number.

21230232320 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 21230232320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28014532560).

21230232320 is an abundant number, since it is smaller than the sum of its proper divisors (34798832800).

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

21230232320 is a wasteful number, since it uses less digits than its factorization.

21230232320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15062 (or 15048 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21230232320 its reverse (2323203212), we get a palindrome (23553435532).

The spelling of 21230232320 in words is "twenty-one billion, two hundred thirty million, two hundred thirty-two thousand, three hundred twenty".