16124431321 has 2 divisors, whose sum is σ = 16124431322. Its totient is φ = 16124431320.

The previous prime is 16124431291. The next prime is 16124431361. The reversal of 16124431321 is 12313442161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14438425600 + 1686005721 = 120160^2 + 41061^2 .

It is a cyclic number.

It is not a de Polignac number, because 16124431321 - 2¹¹ = 16124429273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16124431321.

It is not a weakly prime, because it can be changed into another prime (16124431361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8062215660 + 8062215661.

It is an arithmetic number, because the mean of its divisors is an integer number (8062215661).

Almost surely, 2^16124431321 is an apocalyptic number.

It is an amenable number.

16124431321 is a deficient number, since it is larger than the sum of its proper divisors (1).

16124431321 is an equidigital number, since it uses as much as digits as its factorization.

16124431321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

Adding to 16124431321 its reverse (12313442161), we get a palindrome (28437873482).

The spelling of 16124431321 in words is "sixteen billion, one hundred twenty-four million, four hundred thirty-one thousand, three hundred twenty-one".