21041434320 has 160 divisors (see below), whose sum is σ = 66785904000. Its totient is φ = 5478377472.

The previous prime is 21041434307. The next prime is 21041434321. The reversal of 21041434320 is 2343414012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041434321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2104854 + ... + 2114826.

It is an arithmetic number, because the mean of its divisors is an integer number (417411900).

Almost surely, 2^21041434320 is an apocalyptic number.

21041434320 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 21041434320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33392952000).

21041434320 is an abundant number, since it is smaller than the sum of its proper divisors (45744469680).

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

21041434320 is a wasteful number, since it uses less digits than its factorization.

21041434320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10197 (or 10191 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21041434320 its reverse (2343414012), we get a palindrome (23384848332).

The spelling of 21041434320 in words is "twenty-one billion, forty-one million, four hundred thirty-four thousand, three hundred twenty".