16124351021 has 2 divisors, whose sum is σ = 16124351022. Its totient is φ = 16124351020.

The previous prime is 16124350933. The next prime is 16124351039. The reversal of 16124351021 is 12015342161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13408482025 + 2715868996 = 115795^2 + 52114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16124351021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16124351051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8062175510 + 8062175511.

It is an arithmetic number, because the mean of its divisors is an integer number (8062175511).

Almost surely, 2^16124351021 is an apocalyptic number.

It is an amenable number.

16124351021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16124351021 is an equidigital number, since it uses as much as digits as its factorization.

16124351021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 16124351021 its reverse (12015342161), we get a palindrome (28139693182).

The spelling of 16124351021 in words is "sixteen billion, one hundred twenty-four million, three hundred fifty-one thousand, twenty-one".