21321443000 has 128 divisors (see below), whose sum is σ = 58614978240. Its totient is φ = 7156800000.

The previous prime is 21321442999. The next prime is 21321443051. The reversal of 21321443000 is 34412312.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68450 + ... + 217550.

Almost surely, 2^21321443000 is an apocalyptic number.

21321443000 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 21321443000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29307489120).

21321443000 is an abundant number, since it is smaller than the sum of its proper divisors (37293535240).

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

21321443000 is a wasteful number, since it uses less digits than its factorization.

21321443000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149146 (or 149132 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21321443000 its reverse (34412312), we get a palindrome (21355855312).

The spelling of 21321443000 in words is "twenty-one billion, three hundred twenty-one million, four hundred forty-three thousand".