16131321 has 24 divisors (see below), whose sum is σ = 24211616. Its totient is φ = 10342080.

The previous prime is 16131319. The next prime is 16131329. The reversal of 16131321 is 12313161.

It is not a de Polignac number, because 16131321 - 2¹ = 16131319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16131294 and 16131303.

It is not an unprimeable number, because it can be changed into a prime (16131329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27966 + ... + 28536.

Almost surely, 2^16131321 is an apocalyptic number.

It is an amenable number.

16131321 is a deficient number, since it is larger than the sum of its proper divisors (8080295).

16131321 is a wasteful number, since it uses less digits than its factorization.

16131321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 690 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 16131321 is about 4016.3815804776. The cubic root of 16131321 is about 252.6717245069.

Adding to 16131321 its reverse (12313161), we get a palindrome (28444482).

The spelling of 16131321 in words is "sixteen million, one hundred thirty-one thousand, three hundred twenty-one".