21331203233123 has 6 divisors (see below), whose sum is σ = 24813848658996. Its totient is φ = 18283888485492.

The previous prime is 21331203233101. The next prime is 21331203233143. The reversal of 21331203233123 is 32133230213312.

It is not a de Polignac number, because 21331203233123 - 2³⁰ = 21330129491299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331203233143) 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 5 ways as a sum of consecutive naturals, for example, 217665339065 + ... + 217665339162.

It is an arithmetic number, because the mean of its divisors is an integer number (4135641443166).

Almost surely, 2^{21331203233123} is an apocalyptic number.

21331203233123 is a deficient number, since it is larger than the sum of its proper divisors (3482645425873).

21331203233123 is an equidigital number, since it uses as much as digits as its factorization.

21331203233123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435330678241 (or 435330678234 counting only the distinct ones).

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

Adding to 21331203233123 its reverse (32133230213312), we get a palindrome (53464433446435).

The spelling of 21331203233123 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred three million, two hundred thirty-three thousand, one hundred twenty-three".