21330112231 has 4 divisors (see below), whose sum is σ = 21679786264. Its totient is φ = 20980438200.

The previous prime is 21330112229. The next prime is 21330112249. The reversal of 21330112231 is 13221103312.

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 21330112231 - 2¹ = 21330112229 is a prime.

It is a super-2 number, since 2×21330112231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21330112199 and 21330112208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330112261) 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, 174836925 + ... + 174837046.

It is an arithmetic number, because the mean of its divisors is an integer number (5419946566).

Almost surely, 2^21330112231 is an apocalyptic number.

21330112231 is a deficient number, since it is larger than the sum of its proper divisors (349674033).

21330112231 is an equidigital number, since it uses as much as digits as its factorization.

21330112231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349674032.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21330112231 its reverse (13221103312), we get a palindrome (34551215543).

The spelling of 21330112231 in words is "twenty-one billion, three hundred thirty million, one hundred twelve thousand, two hundred thirty-one".