16521100133 has 4 divisors (see below), whose sum is σ = 16905311808. Its totient is φ = 16136888460.

The previous prime is 16521100111. The next prime is 16521100139. The reversal of 16521100133 is 33100112561.

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 16521100133 - 2²⁰ = 16520051557 is a prime.

It is a super-2 number, since 2×16521100133² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16521100099 and 16521100108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16521100139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192105773 + ... + 192105858.

It is an arithmetic number, because the mean of its divisors is an integer number (4226327952).

Almost surely, 2^16521100133 is an apocalyptic number.

It is an amenable number.

16521100133 is a deficient number, since it is larger than the sum of its proper divisors (384211675).

16521100133 is an equidigital number, since it uses as much as digits as its factorization.

16521100133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384211674.

The product of its (nonzero) digits is 540, while the sum is 23.

Adding to 16521100133 its reverse (33100112561), we get a palindrome (49621212694).

The spelling of 16521100133 in words is "sixteen billion, five hundred twenty-one million, one hundred thousand, one hundred thirty-three".