16821023113 has 4 divisors (see below), whose sum is σ = 17552371968. Its totient is φ = 16089674260.

The previous prime is 16821023111. The next prime is 16821023129. The reversal of 16821023113 is 31132012861.

It is a happy number.

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 16821023113 - 2¹ = 16821023111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16821023111) 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, 365674393 + ... + 365674438.

It is an arithmetic number, because the mean of its divisors is an integer number (4388092992).

Almost surely, 2^16821023113 is an apocalyptic number.

It is an amenable number.

16821023113 is a deficient number, since it is larger than the sum of its proper divisors (731348855).

16821023113 is an equidigital number, since it uses as much as digits as its factorization.

16821023113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731348854.

The product of its (nonzero) digits is 1728, while the sum is 28.

Adding to 16821023113 its reverse (31132012861), we get a palindrome (47953035974).

The spelling of 16821023113 in words is "sixteen billion, eight hundred twenty-one million, twenty-three thousand, one hundred thirteen".