21753043036 has 12 divisors (see below), whose sum is σ = 38190232080. Its totient is φ = 10841548160.

The previous prime is 21753043033. The next prime is 21753043069. The reversal of 21753043036 is 63034035712.

It is a junction number, because it is equal to n+sod(n) for n = 21753042992 and 21753043010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21753043033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8741941 + ... + 8744428.

It is an arithmetic number, because the mean of its divisors is an integer number (3182519340).

Almost surely, 2^21753043036 is an apocalyptic number.

It is an amenable number.

21753043036 is a deficient number, since it is larger than the sum of its proper divisors (16437189044).

21753043036 is a wasteful number, since it uses less digits than its factorization.

21753043036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17486684 (or 17486682 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 34.

Adding to 21753043036 its reverse (63034035712), we get a palindrome (84787078748).

The spelling of 21753043036 in words is "twenty-one billion, seven hundred fifty-three million, forty-three thousand, thirty-six".