21403202403 has 32 divisors (see below), whose sum is σ = 33076823040. Its totient is φ = 12174032160.

The previous prime is 21403202389. The next prime is 21403202411. The reversal of 21403202403 is 30420230412.

It is not a de Polignac number, because 21403202403 - 2²⁹ = 20866331491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21403202403.

It is not an unprimeable number, because it can be changed into a prime (21403202503) 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 31 ways as a sum of consecutive naturals, for example, 92425 + ... + 226602.

It is an arithmetic number, because the mean of its divisors is an integer number (1033650720).

Almost surely, 2^21403202403 is an apocalyptic number.

21403202403 is a deficient number, since it is larger than the sum of its proper divisors (11673620637).

21403202403 is a wasteful number, since it uses less digits than its factorization.

21403202403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319167.

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

Adding to 21403202403 its reverse (30420230412), we get a palindrome (51823432815).

The spelling of 21403202403 in words is "twenty-one billion, four hundred three million, two hundred two thousand, four hundred three".