21344043252 has 192 divisors, whose sum is σ = 61072220160. Its totient is φ = 5663361024.

The previous prime is 21344043191. The next prime is 21344043311. The reversal of 21344043252 is 25234044312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58157973 + ... + 58158339.

It is an arithmetic number, because the mean of its divisors is an integer number (318084480).

Almost surely, 2^21344043252 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21344043252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30536110080).

21344043252 is an abundant number, since it is smaller than the sum of its proper divisors (39728176908).

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

21344043252 is a wasteful number, since it uses less digits than its factorization.

21344043252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 21344043252 its reverse (25234044312), we get a palindrome (46578087564).

The spelling of 21344043252 in words is "twenty-one billion, three hundred forty-four million, forty-three thousand, two hundred fifty-two".