16301317921 has 4 divisors (see below), whose sum is σ = 18630077632. Its totient is φ = 13972558212.

The previous prime is 16301317913. The next prime is 16301317927. The reversal of 16301317921 is 12971310361.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12971310361 = 1481 ⋅8758481.

It is a cyclic number.

It is not a de Polignac number, because 16301317921 - 2³ = 16301317913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16301317927) 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, 1164379845 + ... + 1164379858.

It is an arithmetic number, because the mean of its divisors is an integer number (4657519408).

Almost surely, 2^16301317921 is an apocalyptic number.

It is an amenable number.

16301317921 is a deficient number, since it is larger than the sum of its proper divisors (2328759711).

16301317921 is an equidigital number, since it uses as much as digits as its factorization.

16301317921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328759710.

The product of its (nonzero) digits is 6804, while the sum is 34.

The spelling of 16301317921 in words is "sixteen billion, three hundred one million, three hundred seventeen thousand, nine hundred twenty-one".