21034505403 has 12 divisors (see below), whose sum is σ = 30601760280. Its totient is φ = 13922117856.

The previous prime is 21034505341. The next prime is 21034505411. The reversal of 21034505403 is 30450543012.

21034505403 is a `hidden beast` number, since 210 + 3 + 45 + 0 + 5 + 403 = 666.

It is not a de Polignac number, because 21034505403 - 2¹⁷ = 21034374331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21034505413) 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 11 ways as a sum of consecutive naturals, for example, 8405826 + ... + 8408327.

It is an arithmetic number, because the mean of its divisors is an integer number (2550146690).

Almost surely, 2^21034505403 is an apocalyptic number.

21034505403 is a deficient number, since it is larger than the sum of its proper divisors (9567254877).

21034505403 is a wasteful number, since it uses less digits than its factorization.

21034505403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16814298 (or 16814295 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The spelling of 21034505403 in words is "twenty-one billion, thirty-four million, five hundred five thousand, four hundred three".