21044034330 has 128 divisors (see below), whose sum is σ = 56857925376. Its totient is φ = 4940390400.

The previous prime is 21044034293. The next prime is 21044034337. The reversal of 21044034330 is 3343044012.

It is a self number, because there is not a number n which added to its sum of digits gives 21044034330.

It is not an unprimeable number, because it can be changed into a prime (21044034337) 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, 1847934 + ... + 1859286.

It is an arithmetic number, because the mean of its divisors is an integer number (444202542).

Almost surely, 2^21044034330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21044034330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28428962688).

21044034330 is an abundant number, since it is smaller than the sum of its proper divisors (35813891046).

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

21044034330 is a wasteful number, since it uses less digits than its factorization.

21044034330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11552.

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21044034330 its reverse (3343044012), we get a palindrome (24387078342).

The spelling of 21044034330 in words is "twenty-one billion, forty-four million, thirty-four thousand, three hundred thirty".