21433420033 has 2 divisors, whose sum is σ = 21433420034. Its totient is φ = 21433420032.

The previous prime is 21433420009. The next prime is 21433420097. The reversal of 21433420033 is 33002433412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15295010929 + 6138409104 = 123673^2 + 78348^2 .

It is a cyclic number.

It is not a de Polignac number, because 21433420033 - 2²⁵ = 21399865601 is a prime.

It is a super-2 number, since 2×21433420033² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21433420433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716710016 + 10716710017.

It is an arithmetic number, because the mean of its divisors is an integer number (10716710017).

Almost surely, 2^21433420033 is an apocalyptic number.

It is an amenable number.

21433420033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433420033 is an equidigital number, since it uses as much as digits as its factorization.

21433420033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 21433420033 its reverse (33002433412), we get a palindrome (54435853445).

The spelling of 21433420033 in words is "twenty-one billion, four hundred thirty-three million, four hundred twenty thousand, thirty-three".