21035325544 has 16 divisors (see below), whose sum is σ = 40507215300. Its totient is φ = 10233401472.

The previous prime is 21035325541. The next prime is 21035325589. The reversal of 21035325544 is 44552353012.

It can be written as a sum of positive squares in 2 ways, for example, as 15999720100 + 5035605444 = 126490^2 + 70962^2 .

It is not an unprimeable number, because it can be changed into a prime (21035325541) 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 3 ways as a sum of consecutive naturals, for example, 35532349 + ... + 35532940.

Almost surely, 2^21035325544 is an apocalyptic number.

It is an amenable number.

21035325544 is a deficient number, since it is larger than the sum of its proper divisors (19471889756).

21035325544 is a wasteful number, since it uses less digits than its factorization.

21035325544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71065332 (or 71065328 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 21035325544 its reverse (44552353012), we get a palindrome (65587678556).

The spelling of 21035325544 in words is "twenty-one billion, thirty-five million, three hundred twenty-five thousand, five hundred forty-four".