21835230720 has 160 divisors (see below), whose sum is σ = 69889232160. Its totient is φ = 5815664640.

The previous prime is 21835230713. The next prime is 21835230751. The reversal of 21835230720 is 2703253812.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10451436 + ... + 10453524.

It is an arithmetic number, because the mean of its divisors is an integer number (436807701).

Almost surely, 2^21835230720 is an apocalyptic number.

21835230720 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 21835230720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34944616080).

21835230720 is an abundant number, since it is smaller than the sum of its proper divisors (48054001440).

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

21835230720 is a wasteful number, since it uses less digits than its factorization.

21835230720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3476 (or 3460 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The spelling of 21835230720 in words is "twenty-one billion, eight hundred thirty-five million, two hundred thirty thousand, seven hundred twenty".