21033110111231 has 4 divisors (see below), whose sum is σ = 21033202764000. Its totient is φ = 21033017458464.

The previous prime is 21033110111219. The next prime is 21033110111239. The reversal of 21033110111231 is 13211101133012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21033110111231 is a prime.

It is a super-2 number, since 2×21033110111231² (a number of 27 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 (21033110111239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45985031 + ... + 46440168.

It is an arithmetic number, because the mean of its divisors is an integer number (5258300691000).

Almost surely, 2^{21033110111231} is an apocalyptic number.

21033110111231 is a deficient number, since it is larger than the sum of its proper divisors (92652769).

21033110111231 is an equidigital number, since it uses as much as digits as its factorization.

21033110111231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92652768.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 21033110111231 its reverse (13211101133012), we get a palindrome (34244211244243).

The spelling of 21033110111231 in words is "twenty-one trillion, thirty-three billion, one hundred ten million, one hundred eleven thousand, two hundred thirty-one".