161122321012321 has 16 divisors (see below), whose sum is σ = 164965510543680. Its totient is φ = 157318947741760.

The previous prime is 161122321012319. The next prime is 161122321012339. The reversal of 161122321012321 is 123210123221161.

It is a cyclic number.

It is not a de Polignac number, because 161122321012321 - 2¹ = 161122321012319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161122321012321.

It is not an unprimeable number, because it can be changed into a prime (161122321012381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4985110 + ... + 18630511.

It is an arithmetic number, because the mean of its divisors is an integer number (10310344408980).

Almost surely, 2^{161122321012321} is an apocalyptic number.

It is an amenable number.

161122321012321 is a deficient number, since it is larger than the sum of its proper divisors (3843189531359).

161122321012321 is a wasteful number, since it uses less digits than its factorization.

161122321012321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23616464.

The product of its (nonzero) digits is 1728, while the sum is 28.

Adding to 161122321012321 its reverse (123210123221161), we get a palindrome (284332444233482).

The spelling of 161122321012321 in words is "one hundred sixty-one trillion, one hundred twenty-two billion, three hundred twenty-one million, twelve thousand, three hundred twenty-one".