21344988000 has 576 divisors, whose sum is σ = 84038363136. Its totient is φ = 4717440000.

The previous prime is 21344987981. The next prime is 21344988013. The reversal of 21344988000 is 88944312.

It is a self number, because there is not a number n which added to its sum of digits gives 21344988000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18227415 + ... + 18228585.

It is an arithmetic number, because the mean of its divisors is an integer number (145899936).

Almost surely, 2^21344988000 is an apocalyptic number.

21344988000 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 21344988000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42019181568).

21344988000 is an abundant number, since it is smaller than the sum of its proper divisors (62693375136).

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

21344988000 is a wasteful number, since it uses less digits than its factorization.

21344988000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244 (or 1219 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The spelling of 21344988000 in words is "twenty-one billion, three hundred forty-four million, nine hundred eighty-eight thousand".