20160521321 has 2 divisors, whose sum is σ = 20160521322. Its totient is φ = 20160521320.

The previous prime is 20160521291. The next prime is 20160521327. The reversal of 20160521321 is 12312506102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14332878400 + 5827642921 = 119720^2 + 76339^2 .

It is a cyclic number.

It is not a de Polignac number, because 20160521321 - 2¹⁰ = 20160520297 is a prime.

It is not a weakly prime, because it can be changed into another prime (20160521327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10080260660 + 10080260661.

It is an arithmetic number, because the mean of its divisors is an integer number (10080260661).

Almost surely, 2^20160521321 is an apocalyptic number.

It is an amenable number.

20160521321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20160521321 is an equidigital number, since it uses as much as digits as its factorization.

20160521321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The spelling of 20160521321 in words is "twenty billion, one hundred sixty million, five hundred twenty-one thousand, three hundred twenty-one".