21103000544 has 12 divisors (see below), whose sum is σ = 41546532384. Its totient is φ = 10551500256.

The previous prime is 21103000537. The next prime is 21103000547. The reversal of 21103000544 is 44500030112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103000547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329734352 + ... + 329734415.

It is an arithmetic number, because the mean of its divisors is an integer number (3462211032).

Almost surely, 2^21103000544 is an apocalyptic number.

It is an amenable number.

21103000544 is a deficient number, since it is larger than the sum of its proper divisors (20443531840).

21103000544 is an equidigital number, since it uses as much as digits as its factorization.

21103000544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659468777 (or 659468769 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21103000544 its reverse (44500030112), we get a palindrome (65603030656).

The spelling of 21103000544 in words is "twenty-one billion, one hundred three million, five hundred forty-four", and thus it is an aban number.