21404401003 has 8 divisors (see below), whose sum is σ = 21505075200. Its totient is φ = 21303769128.

The previous prime is 21404400977. The next prime is 21404401043. The reversal of 21404401003 is 30010440412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21404401003 - 2⁵ = 21404400971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21404401043) 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 7 ways as a sum of consecutive naturals, for example, 1504638 + ... + 1518796.

It is an arithmetic number, because the mean of its divisors is an integer number (2688134400).

Almost surely, 2^21404401003 is an apocalyptic number.

21404401003 is a deficient number, since it is larger than the sum of its proper divisors (100674197).

21404401003 is a wasteful number, since it uses less digits than its factorization.

21404401003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21161.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21404401003 its reverse (30010440412), we get a palindrome (51414841415).

The spelling of 21404401003 in words is "twenty-one billion, four hundred four million, four hundred one thousand, three".