21323232000 has 648 divisors, whose sum is σ = 89313168672. Its totient is φ = 4870656000.

The previous prime is 21323231999. The next prime is 21323232013. The reversal of 21323232000 is 23232312.

It is a happy number.

21323232000 is a `hidden beast` number, since 21 + 323 + 2 + 320 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 14111245 + ... + 14112755.

It is an arithmetic number, because the mean of its divisors is an integer number (137828964).

Almost surely, 2^21323232000 is an apocalyptic number.

21323232000 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 21323232000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44656584336).

21323232000 is an abundant number, since it is smaller than the sum of its proper divisors (67989936672).

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

21323232000 is a wasteful number, since it uses less digits than its factorization.

21323232000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562 (or 1528 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21323232000 its reverse (23232312), we get a palindrome (21346464312).

The spelling of 21323232000 in words is "twenty-one billion, three hundred twenty-three million, two hundred thirty-two thousand".