21441235636 has 12 divisors (see below), whose sum is σ = 37524195940. Its totient is φ = 10720036800.

The previous prime is 21441235583. The next prime is 21441235639. The reversal of 21441235636 is 63653214412.

It can be written as a sum of positive squares in 2 ways, for example, as 6659539236 + 14781696400 = 81606^2 + 121580^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21441235595 and 21441235604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441235639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56151 + ... + 214558.

Almost surely, 2^21441235636 is an apocalyptic number.

It is an amenable number.

21441235636 is a deficient number, since it is larger than the sum of its proper divisors (16082960304).

21441235636 is a wasteful number, since it uses less digits than its factorization.

21441235636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290514 (or 290512 counting only the distinct ones).

The product of its digits is 103680, while the sum is 37.

The spelling of 21441235636 in words is "twenty-one billion, four hundred forty-one million, two hundred thirty-five thousand, six hundred thirty-six".