16105202821 has 2 divisors, whose sum is σ = 16105202822. Its totient is φ = 16105202820.

The previous prime is 16105202779. The next prime is 16105202831. The reversal of 16105202821 is 12820250161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11387024100 + 4718178721 = 106710^2 + 68689^2 .

It is an emirp because it is prime and its reverse (12820250161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16105202821 - 2¹¹ = 16105200773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16105202821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16105202831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8052601410 + 8052601411.

It is an arithmetic number, because the mean of its divisors is an integer number (8052601411).

Almost surely, 2^16105202821 is an apocalyptic number.

It is an amenable number.

16105202821 is a deficient number, since it is larger than the sum of its proper divisors (1).

16105202821 is an equidigital number, since it uses as much as digits as its factorization.

16105202821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 28.

Adding to 16105202821 its reverse (12820250161), we get a palindrome (28925452982).

The spelling of 16105202821 in words is "sixteen billion, one hundred five million, two hundred two thousand, eight hundred twenty-one".