21403321203 has 16 divisors (see below), whose sum is σ = 31140907776. Its totient is φ = 12968041440.

The previous prime is 21403321193. The next prime is 21403321207. The reversal of 21403321203 is 30212330412.

It is not a de Polignac number, because 21403321203 - 2⁸ = 21403320947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21403321203.

It is not an unprimeable number, because it can be changed into a prime (21403321207) 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, 29125 + ... + 208937.

It is an arithmetic number, because the mean of its divisors is an integer number (1946306736).

Almost surely, 2^21403321203 is an apocalyptic number.

21403321203 is a deficient number, since it is larger than the sum of its proper divisors (9737586573).

21403321203 is a wasteful number, since it uses less digits than its factorization.

21403321203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183434.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21403321203 its reverse (30212330412), we get a palindrome (51615651615).

The spelling of 21403321203 in words is "twenty-one billion, four hundred three million, three hundred twenty-one thousand, two hundred three".