21203321203 has 16 divisors (see below), whose sum is σ = 22012931520. Its totient is φ = 20399105664.

The previous prime is 21203321189. The next prime is 21203321231. The reversal of 21203321203 is 30212330212.

It is a cyclic number.

It is not a de Polignac number, because 21203321203 - 2¹³ = 21203313011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203327203) 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, 13740850 + ... + 13742392.

It is an arithmetic number, because the mean of its divisors is an integer number (1375808220).

Almost surely, 2^21203321203 is an apocalyptic number.

21203321203 is a deficient number, since it is larger than the sum of its proper divisors (809610317).

21203321203 is a wasteful number, since it uses less digits than its factorization.

21203321203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2958.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21203321203 its reverse (30212330212), we get a palindrome (51415651415).

Subtracting 21203321203 from its reverse (30212330212), we obtain a palindrome (9009009009).

The spelling of 21203321203 in words is "twenty-one billion, two hundred three million, three hundred twenty-one thousand, two hundred three".