16521100023 has 4 divisors (see below), whose sum is σ = 22028133368. Its totient is φ = 11014066680.

The previous prime is 16521100009. The next prime is 16521100033. The reversal of 16521100023 is 32000112561.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16521100023 - 2¹⁰ = 16521098999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16521100033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2753516668 + ... + 2753516673.

It is an arithmetic number, because the mean of its divisors is an integer number (5507033342).

Almost surely, 2^16521100023 is an apocalyptic number.

16521100023 is a deficient number, since it is larger than the sum of its proper divisors (5507033345).

16521100023 is an equidigital number, since it uses as much as digits as its factorization.

16521100023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5507033344.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 16521100023 its reverse (32000112561), we get a palindrome (48521212584).

The spelling of 16521100023 in words is "sixteen billion, five hundred twenty-one million, one hundred thousand, twenty-three".