161024013721 has 2 divisors, whose sum is σ = 161024013722. Its totient is φ = 161024013720.

The previous prime is 161024013701. The next prime is 161024013751. The reversal of 161024013721 is 127310420161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124919833600 + 36104180121 = 353440^2 + 190011^2 .

It is an emirp because it is prime and its reverse (127310420161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161024013721 - 2²⁷ = 160889795993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161024013721.

It is not a weakly prime, because it can be changed into another prime (161024013701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80512006860 + 80512006861.

It is an arithmetic number, because the mean of its divisors is an integer number (80512006861).

Almost surely, 2^161024013721 is an apocalyptic number.

It is an amenable number.

161024013721 is a deficient number, since it is larger than the sum of its proper divisors (1).

161024013721 is an equidigital number, since it uses as much as digits as its factorization.

161024013721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

Adding to 161024013721 its reverse (127310420161), we get a palindrome (288334433882).

The spelling of 161024013721 in words is "one hundred sixty-one billion, twenty-four million, thirteen thousand, seven hundred twenty-one".