21404123303 has 16 divisors (see below), whose sum is σ = 22094248800. Its totient is φ = 20720157696.

The previous prime is 21404123281. The next prime is 21404123317. The reversal of 21404123303 is 30332140412.

It is a cyclic number.

It is not a de Polignac number, because 21404123303 - 2⁸ = 21404123047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404123353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7018523 + ... + 7021571.

It is an arithmetic number, because the mean of its divisors is an integer number (1380890550).

Almost surely, 2^21404123303 is an apocalyptic number.

21404123303 is a deficient number, since it is larger than the sum of its proper divisors (690125497).

21404123303 is a wasteful number, since it uses less digits than its factorization.

21404123303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21404123303 its reverse (30332140412), we get a palindrome (51736263715).

The spelling of 21404123303 in words is "twenty-one billion, four hundred four million, one hundred twenty-three thousand, three hundred three".