12033220021 has 2 divisors, whose sum is σ = 12033220022. Its totient is φ = 12033220020.

The previous prime is 12033220019. The next prime is 12033220027. The reversal of 12033220021 is 12002233021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8298299025 + 3734920996 = 91095^2 + 61114^2 .

It is a cyclic number.

It is not a de Polignac number, because 12033220021 - 2¹ = 12033220019 is a prime.

Together with 12033220019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12033219977 and 12033220004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12033220027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6016610010 + 6016610011.

It is an arithmetic number, because the mean of its divisors is an integer number (6016610011).

Almost surely, 2^12033220021 is an apocalyptic number.

It is an amenable number.

12033220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12033220021 is an equidigital number, since it uses as much as digits as its factorization.

12033220021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 12033220021 its reverse (12002233021), we get a palindrome (24035453042).

The spelling of 12033220021 in words is "twelve billion, thirty-three million, two hundred twenty thousand, twenty-one".