21232320000 has 400 divisors, whose sum is σ = 74897987472. Its totient is φ = 5324800000.

The previous prime is 21232319971. The next prime is 21232320023. The reversal of 21232320000 is 2323212.

It is a tau number, because it is divible by the number of its divisors (400).

It is a super-2 number, since 2×21232320000² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 16319350 + ... + 16320650.

Almost surely, 2^21232320000 is an apocalyptic number.

21232320000 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 21232320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37448993736).

21232320000 is an abundant number, since it is smaller than the sum of its proper divisors (53665667472).

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

21232320000 is an equidigital number, since it uses as much as digits as its factorization.

21232320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359 (or 1328 counting only the distinct ones).

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

Adding to 21232320000 its reverse (2323212), we get a palindrome (21234643212).

The spelling of 21232320000 in words is "twenty-one billion, two hundred thirty-two million, three hundred twenty thousand".