12133212021 has 40 divisors (see below), whose sum is σ = 20741878080. Its totient is φ = 6923999232.

The previous prime is 12133212017. The next prime is 12133212023. The reversal of 12133212021 is 12021233121.

It is not a de Polignac number, because 12133212021 - 2² = 12133212017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12133211985 and 12133212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12133212023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 422110 + ... + 449936.

It is an arithmetic number, because the mean of its divisors is an integer number (518546952).

Almost surely, 2^12133212021 is an apocalyptic number.

It is an amenable number.

12133212021 is a deficient number, since it is larger than the sum of its proper divisors (8608666059).

12133212021 is an equidigital number, since it uses as much as digits as its factorization.

12133212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28615 (or 28606 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12133212021 its reverse (12021233121), we get a palindrome (24154445142).

The spelling of 12133212021 in words is "twelve billion, one hundred thirty-three million, two hundred twelve thousand, twenty-one".