21110131233 has 6 divisors (see below), whose sum is σ = 30492411794. Its totient is φ = 14073420816.

The previous prime is 21110131223. The next prime is 21110131247. The reversal of 21110131233 is 33213101112.

It can be written as a sum of positive squares in only one way, i.e., 17344099809 + 3766031424 = 131697^2 + 61368^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21110131233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110131223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1172785060 + ... + 1172785077.

Almost surely, 2^21110131233 is an apocalyptic number.

It is an amenable number.

21110131233 is a deficient number, since it is larger than the sum of its proper divisors (9382280561).

21110131233 is a wasteful number, since it uses less digits than its factorization.

21110131233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345570143 (or 2345570140 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21110131233 its reverse (33213101112), we get a palindrome (54323232345).

The spelling of 21110131233 in words is "twenty-one billion, one hundred ten million, one hundred thirty-one thousand, two hundred thirty-three".