21243340000 has 120 divisors (see below), whose sum is σ = 52429535928. Its totient is φ = 8470080000.

The previous prime is 21243339973. The next prime is 21243340039. The reversal of 21243340000 is 4334212.

It is a self number, because there is not a number n which added to its sum of digits gives 21243340000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6938470 + ... + 6941530.

Almost surely, 2^21243340000 is an apocalyptic number.

21243340000 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 21243340000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26214767964).

21243340000 is an abundant number, since it is smaller than the sum of its proper divisors (31186195928).

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

21243340000 is an equidigital number, since it uses as much as digits as its factorization.

21243340000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3438 (or 3415 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21243340000 its reverse (4334212), we get a palindrome (21247674212).

The spelling of 21243340000 in words is "twenty-one billion, two hundred forty-three million, three hundred forty thousand".