21852702720 has 192 divisors, whose sum is σ = 77680512000. Its totient is φ = 5827313664.

The previous prime is 21852702701. The next prime is 21852702721. The reversal of 21852702720 is 2720725812.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21852702721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236961 + ... + 315999.

It is an arithmetic number, because the mean of its divisors is an integer number (404586000).

Almost surely, 2^21852702720 is an apocalyptic number.

21852702720 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 21852702720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38840256000).

21852702720 is an abundant number, since it is smaller than the sum of its proper divisors (55827809280).

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

21852702720 is an equidigital number, since it uses as much as digits as its factorization.

21852702720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79075 (or 79049 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The spelling of 21852702720 in words is "twenty-one billion, eight hundred fifty-two million, seven hundred two thousand, seven hundred twenty".