21324440000 has 70 divisors (see below), whose sum is σ = 52877779944. Its totient is φ = 8529760000.

The previous prime is 21324439999. The next prime is 21324440021. The reversal of 21324440000 is 4442312.

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 9 ways as a sum of consecutive naturals, for example, 226556 + ... + 306555.

Almost surely, 2^21324440000 is an apocalyptic number.

21324440000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21324440000 is an abundant number, since it is smaller than the sum of its proper divisors (31553339944).

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

21324440000 is an frugal number, since it uses more digits than its factorization.

21324440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533143 (or 533118 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21324440000 its reverse (4442312), we get a palindrome (21328882312).

The spelling of 21324440000 in words is "twenty-one billion, three hundred twenty-four million, four hundred forty thousand".