20003012321161 has 2 divisors, whose sum is σ = 20003012321162. Its totient is φ = 20003012321160.

The previous prime is 20003012321023. The next prime is 20003012321207. The reversal of 20003012321161 is 16112321030002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18637620071161 + 1365392250000 = 4317131^2 + 1168500^2 .

It is a cyclic number.

It is not a de Polignac number, because 20003012321161 - 2¹⁵ = 20003012288393 is a prime.

It is not a weakly prime, because it can be changed into another prime (20003012321561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001506160580 + 10001506160581.

It is an arithmetic number, because the mean of its divisors is an integer number (10001506160581).

Almost surely, 2^{20003012321161} is an apocalyptic number.

It is an amenable number.

20003012321161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003012321161 is an equidigital number, since it uses as much as digits as its factorization.

20003012321161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 20003012321161 its reverse (16112321030002), we get a palindrome (36115333351163).

The spelling of 20003012321161 in words is "twenty trillion, three billion, twelve million, three hundred twenty-one thousand, one hundred sixty-one".