21031231332233 has 4 divisors (see below), whose sum is σ = 21945632694528. Its totient is φ = 20116829969940.

The previous prime is 21031231332227. The next prime is 21031231332259. The reversal of 21031231332233 is 33223313213012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21031231332233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031231332196 and 21031231332205.

It is not an unprimeable number, because it can be changed into a prime (21031231332203) 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, 457200681113 + ... + 457200681158.

It is an arithmetic number, because the mean of its divisors is an integer number (5486408173632).

Almost surely, 2^{21031231332233} is an apocalyptic number.

21031231332233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21031231332233 is a deficient number, since it is larger than the sum of its proper divisors (914401362295).

21031231332233 is an equidigital number, since it uses as much as digits as its factorization.

21031231332233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914401362294.

The product of its (nonzero) digits is 11664, while the sum is 29.

Adding to 21031231332233 its reverse (33223313213012), we get a palindrome (54254544545245).

The spelling of 21031231332233 in words is "twenty-one trillion, thirty-one billion, two hundred thirty-one million, three hundred thirty-two thousand, two hundred thirty-three".