21403012203 has 12 divisors (see below), whose sum is σ = 30928466400. Its totient is φ = 14262672816.

The previous prime is 21403012199. The next prime is 21403012217. The reversal of 21403012203 is 30221030412.

21403012203 is a `hidden beast` number, since 2 + 140 + 301 + 220 + 3 = 666.

It is not a de Polignac number, because 21403012203 - 2² = 21403012199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21403017203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 477528 + ... + 520421.

It is an arithmetic number, because the mean of its divisors is an integer number (2577372200).

Almost surely, 2^21403012203 is an apocalyptic number.

21403012203 is a deficient number, since it is larger than the sum of its proper divisors (9525454197).

21403012203 is a wasteful number, since it uses less digits than its factorization.

21403012203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000338 (or 1000335 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21403012203 its reverse (30221030412), we get a palindrome (51624042615).

The spelling of 21403012203 in words is "twenty-one billion, four hundred three million, twelve thousand, two hundred three".