21040000544 has 48 divisors (see below), whose sum is σ = 41588715168. Its totient is φ = 10477888512.

The previous prime is 21040000523. The next prime is 21040000567. The reversal of 21040000544 is 44500004012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10378859 + ... + 10380885.

It is an arithmetic number, because the mean of its divisors is an integer number (866431566).

Almost surely, 2^21040000544 is an apocalyptic number.

It is an amenable number.

21040000544 is a deficient number, since it is larger than the sum of its proper divisors (20548714624).

21040000544 is a wasteful number, since it uses less digits than its factorization.

21040000544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3177 (or 3169 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 21040000544 its reverse (44500004012), we get a palindrome (65540004556).

The spelling of 21040000544 in words is "twenty-one billion, forty million, five hundred forty-four", and thus it is an aban number.