21730303033 has 4 divisors (see below), whose sum is σ = 22005370240. Its totient is φ = 21455235828.

The previous prime is 21730303003. The next prime is 21730303051. The reversal of 21730303033 is 33030303712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21730303033 - 2¹³ = 21730294841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21730302989 and 21730303007.

It is not an unprimeable number, because it can be changed into a prime (21730303003) 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 in 3 ways as a sum of consecutive naturals, for example, 137533485 + ... + 137533642.

It is an arithmetic number, because the mean of its divisors is an integer number (5501342560).

Almost surely, 2^21730303033 is an apocalyptic number.

It is an amenable number.

21730303033 is a deficient number, since it is larger than the sum of its proper divisors (275067207).

21730303033 is an equidigital number, since it uses as much as digits as its factorization.

21730303033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275067206.

The product of its (nonzero) digits is 3402, while the sum is 25.

Adding to 21730303033 its reverse (33030303712), we get a palindrome (54760606745).

The spelling of 21730303033 in words is "twenty-one billion, seven hundred thirty million, three hundred three thousand, thirty-three".