16721246233 has 4 divisors (see below), whose sum is σ = 16722030208. Its totient is φ = 16720462260.

The previous prime is 16721246207. The next prime is 16721246239. The reversal of 16721246233 is 33264212761.

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 16721246233 - 2²¹ = 16719149081 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16721246192 and 16721246201.

It is not an unprimeable number, because it can be changed into a prime (16721246239) 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, 359073 + ... + 402958.

It is an arithmetic number, because the mean of its divisors is an integer number (4180507552).

Almost surely, 2^16721246233 is an apocalyptic number.

It is an amenable number.

16721246233 is a deficient number, since it is larger than the sum of its proper divisors (783975).

16721246233 is an equidigital number, since it uses as much as digits as its factorization.

16721246233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783974.

The product of its digits is 72576, while the sum is 37.

Adding to 16721246233 its reverse (33264212761), we get a palindrome (49985458994).

The spelling of 16721246233 in words is "sixteen billion, seven hundred twenty-one million, two hundred forty-six thousand, two hundred thirty-three".