21104003144 has 32 divisors (see below), whose sum is σ = 46325865600. Its totient is φ = 8823972480.

The previous prime is 21104003143. The next prime is 21104003183. The reversal of 21104003144 is 44130040112.

It is not an unprimeable number, because it can be changed into a prime (21104003143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4593524 + ... + 4598115.

It is an arithmetic number, because the mean of its divisors is an integer number (1447683300).

Almost surely, 2^21104003144 is an apocalyptic number.

It is an amenable number.

21104003144 is an abundant number, since it is smaller than the sum of its proper divisors (25221862456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21104003144 is a wasteful number, since it uses less digits than its factorization.

21104003144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9191693 (or 9191689 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21104003144 its reverse (44130040112), we get a palindrome (65234043256).

The spelling of 21104003144 in words is "twenty-one billion, one hundred four million, three thousand, one hundred forty-four".