21033100433 has 2 divisors, whose sum is σ = 21033100434. Its totient is φ = 21033100432.

The previous prime is 21033100369. The next prime is 21033100447. The reversal of 21033100433 is 33400133012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20992242769 + 40857664 = 144887^2 + 6392^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033100433 - 2⁶ = 21033100369 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21033100493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516550216 + 10516550217.

It is an arithmetic number, because the mean of its divisors is an integer number (10516550217).

Almost surely, 2^21033100433 is an apocalyptic number.

It is an amenable number.

21033100433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033100433 is an equidigital number, since it uses as much as digits as its factorization.

21033100433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21033100433 its reverse (33400133012), we get a palindrome (54433233445).

The spelling of 21033100433 in words is "twenty-one billion, thirty-three million, one hundred thousand, four hundred thirty-three".