21331231203 has 4 divisors (see below), whose sum is σ = 28441641608. Its totient is φ = 14220820800.

The previous prime is 21331231193. The next prime is 21331231247. The reversal of 21331231203 is 30213213312.

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

It is not a de Polignac number, because 21331231203 - 2⁶ = 21331231139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21331231203.

It is not an unprimeable number, because it can be changed into a prime (21331231903) 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 3 ways as a sum of consecutive naturals, for example, 3555205198 + ... + 3555205203.

It is an arithmetic number, because the mean of its divisors is an integer number (7110410402).

Almost surely, 2^21331231203 is an apocalyptic number.

21331231203 is a deficient number, since it is larger than the sum of its proper divisors (7110410405).

21331231203 is an equidigital number, since it uses as much as digits as its factorization.

21331231203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7110410404.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21331231203 its reverse (30213213312), we get a palindrome (51544444515).

The spelling of 21331231203 in words is "twenty-one billion, three hundred thirty-one million, two hundred thirty-one thousand, two hundred three".