21231204203 has 32 divisors (see below), whose sum is σ = 24050138112. Its totient is φ = 18576345600.

The previous prime is 21231204193. The next prime is 21231204233. The reversal of 21231204203 is 30240213212.

It is a cyclic number.

It is not a de Polignac number, because 21231204203 - 2⁴ = 21231204187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21231204233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10340525 + ... + 10342577.

It is an arithmetic number, because the mean of its divisors is an integer number (751566816).

Almost surely, 2^21231204203 is an apocalyptic number.

21231204203 is a deficient number, since it is larger than the sum of its proper divisors (2818933909).

21231204203 is a wasteful number, since it uses less digits than its factorization.

21231204203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21231204203 its reverse (30240213212), we get a palindrome (51471417415).

Subtracting 21231204203 from its reverse (30240213212), we obtain a palindrome (9009009009).

The spelling of 21231204203 in words is "twenty-one billion, two hundred thirty-one million, two hundred four thousand, two hundred three".