21004234033 has 2 divisors, whose sum is σ = 21004234034. Its totient is φ = 21004234032.

The previous prime is 21004234003. The next prime is 21004234051. The reversal of 21004234033 is 33043240012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20975149584 + 29084449 = 144828^2 + 5393^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21004234033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21004233995 and 21004234013.

It is not a weakly prime, because it can be changed into another prime (21004234003) 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 as a sum of consecutive naturals, namely, 10502117016 + 10502117017.

It is an arithmetic number, because the mean of its divisors is an integer number (10502117017).

Almost surely, 2^21004234033 is an apocalyptic number.

It is an amenable number.

21004234033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004234033 is an equidigital number, since it uses as much as digits as its factorization.

21004234033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21004234033 its reverse (33043240012), we get a palindrome (54047474045).

The spelling of 21004234033 in words is "twenty-one billion, four million, two hundred thirty-four thousand, thirty-three".