16521100033 has 2 divisors, whose sum is σ = 16521100034. Its totient is φ = 16521100032.

The previous prime is 16521100009. The next prime is 16521100111. The reversal of 16521100033 is 33000112561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10981572849 + 5539527184 = 104793^2 + 74428^2 .

It is a cyclic number.

It is not a de Polignac number, because 16521100033 - 2⁹ = 16521099521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16521099977 and 16521100013.

It is not a weakly prime, because it can be changed into another prime (16521100333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8260550016 + 8260550017.

It is an arithmetic number, because the mean of its divisors is an integer number (8260550017).

Almost surely, 2^16521100033 is an apocalyptic number.

It is an amenable number.

16521100033 is a deficient number, since it is larger than the sum of its proper divisors (1).

16521100033 is an equidigital number, since it uses as much as digits as its factorization.

16521100033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 16521100033 its reverse (33000112561), we get a palindrome (49521212594).

The spelling of 16521100033 in words is "sixteen billion, five hundred twenty-one million, one hundred thousand, thirty-three".