21233113231 has 4 divisors (see below), whose sum is σ = 23163396264. Its totient is φ = 19302830200.

The previous prime is 21233113217. The next prime is 21233113267. The reversal of 21233113231 is 13231133212.

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 21233113231 - 2⁷ = 21233113103 is a prime.

It is a super-3 number, since 3×21233113231³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233123231) 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, 965141500 + ... + 965141521.

It is an arithmetic number, because the mean of its divisors is an integer number (5790849066).

Almost surely, 2^21233113231 is an apocalyptic number.

21233113231 is a deficient number, since it is larger than the sum of its proper divisors (1930283033).

21233113231 is a wasteful number, since it uses less digits than its factorization.

21233113231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930283032.

The product of its digits is 648, while the sum is 22.

Adding to 21233113231 its reverse (13231133212), we get a palindrome (34464246443).

The spelling of 21233113231 in words is "twenty-one billion, two hundred thirty-three million, one hundred thirteen thousand, two hundred thirty-one".