21035334240 has 144 divisors (see below), whose sum is σ = 72159849216. Its totient is φ = 5579980800.

The previous prime is 21035334233. The next prime is 21035334269. The reversal of 21035334240 is 4243353012.

21035334240 is a `hidden beast` number, since 2 + 103 + 533 + 4 + 24 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 236800 + ... + 313280.

It is an arithmetic number, because the mean of its divisors is an integer number (501110064).

Almost surely, 2^21035334240 is an apocalyptic number.

21035334240 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 21035334240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36079924608).

21035334240 is an abundant number, since it is smaller than the sum of its proper divisors (51124514976).

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

21035334240 is a wasteful number, since it uses less digits than its factorization.

21035334240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76693 (or 76682 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

Adding to 21035334240 its reverse (4243353012), we get a palindrome (25278687252).

The spelling of 21035334240 in words is "twenty-one billion, thirty-five million, three hundred thirty-four thousand, two hundred forty".