21404403003 has 16 divisors (see below), whose sum is σ = 29501465600. Its totient is φ = 13789772640.

The previous prime is 21404402951. The next prime is 21404403043. The reversal of 21404403003 is 30030440412.

It is not a de Polignac number, because 21404403003 - 2⁹ = 21404402491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21404403043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96373 + ... + 228246.

It is an arithmetic number, because the mean of its divisors is an integer number (1843841600).

Almost surely, 2^21404403003 is an apocalyptic number.

21404403003 is a deficient number, since it is larger than the sum of its proper divisors (8097062597).

21404403003 is a wasteful number, since it uses less digits than its factorization.

21404403003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325362.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21404403003 its reverse (30030440412), we get a palindrome (51434843415).

The spelling of 21404403003 in words is "twenty-one billion, four hundred four million, four hundred three thousand, three".