21233203231 has 4 divisors (see below), whose sum is σ = 21233495952. Its totient is φ = 21232910512.

The previous prime is 21233203223. The next prime is 21233203297. The reversal of 21233203231 is 13230233212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21233203231 - 2³ = 21233203223 is a prime.

It is a super-2 number, since 2×21233203231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233203331) 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, 52611 + ... + 212683.

It is an arithmetic number, because the mean of its divisors is an integer number (5308373988).

Almost surely, 2^21233203231 is an apocalyptic number.

21233203231 is a deficient number, since it is larger than the sum of its proper divisors (292721).

21233203231 is a wasteful number, since it uses less digits than its factorization.

21233203231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292720.

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

Adding to 21233203231 its reverse (13230233212), we get a palindrome (34463436443).

The spelling of 21233203231 in words is "twenty-one billion, two hundred thirty-three million, two hundred three thousand, two hundred thirty-one".