21223344000 has 512 divisors, whose sum is σ = 76988620800. Its totient is φ = 5148672000.

The previous prime is 21223343959. The next prime is 21223344007. The reversal of 21223344000 is 44332212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223344007) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25295581 + ... + 25296419.

It is an arithmetic number, because the mean of its divisors is an integer number (150368400).

Almost surely, 2^21223344000 is an apocalyptic number.

21223344000 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 21223344000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38494310400).

21223344000 is an abundant number, since it is smaller than the sum of its proper divisors (55765276800).

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

21223344000 is a wasteful number, since it uses less digits than its factorization.

21223344000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919 (or 897 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21223344000 its reverse (44332212), we get a palindrome (21267676212).

The spelling of 21223344000 in words is "twenty-one billion, two hundred twenty-three million, three hundred forty-four thousand".