21704375456 has 96 divisors (see below), whose sum is σ = 45865954512. Its totient is φ = 10074193920.

The previous prime is 21704375453. The next prime is 21704375467. The reversal of 21704375456 is 65457340712.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 11466983056 + 10237392400 = 107084^2 + 101180^2 .

It is not an unprimeable number, because it can be changed into a prime (21704375453) 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 15 ways as a sum of consecutive naturals, for example, 22214840 + ... + 22215816.

Almost surely, 2^21704375456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21704375456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22932977256).

21704375456 is an abundant number, since it is smaller than the sum of its proper divisors (24161579056).

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

21704375456 is a wasteful number, since it uses less digits than its factorization.

21704375456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522 (or 1514 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 44.

The spelling of 21704375456 in words is "twenty-one billion, seven hundred four million, three hundred seventy-five thousand, four hundred fifty-six".