21231233203 has 4 divisors (see below), whose sum is σ = 21522072088. Its totient is φ = 20940394320.

The previous prime is 21231233189. The next prime is 21231233209. The reversal of 21231233203 is 30233213212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21231233203 - 2²⁹ = 20694362291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231233209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145419333 + ... + 145419478.

It is an arithmetic number, because the mean of its divisors is an integer number (5380518022).

Almost surely, 2^21231233203 is an apocalyptic number.

21231233203 is a deficient number, since it is larger than the sum of its proper divisors (290838885).

21231233203 is an equidigital number, since it uses as much as digits as its factorization.

21231233203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290838884.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21231233203 its reverse (30233213212), we get a palindrome (51464446415).

The spelling of 21231233203 in words is "twenty-one billion, two hundred thirty-one million, two hundred thirty-three thousand, two hundred three".