21033110231 has 4 divisors (see below), whose sum is σ = 24037840272. Its totient is φ = 18028380192.

The previous prime is 21033110191. The next prime is 21033110251. The reversal of 21033110231 is 13201133012.

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 21033110231 - 2²² = 21028915927 is a prime.

It is a super-2 number, since 2×21033110231² (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 (21033110251) 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, 1502365010 + ... + 1502365023.

It is an arithmetic number, because the mean of its divisors is an integer number (6009460068).

Almost surely, 2^21033110231 is an apocalyptic number.

21033110231 is a deficient number, since it is larger than the sum of its proper divisors (3004730041).

21033110231 is an equidigital number, since it uses as much as digits as its factorization.

21033110231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004730040.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21033110231 its reverse (13201133012), we get a palindrome (34234243243).

The spelling of 21033110231 in words is "twenty-one billion, thirty-three million, one hundred ten thousand, two hundred thirty-one".