20173120001 has 2 divisors, whose sum is σ = 20173120002. Its totient is φ = 20173120000.

The previous prime is 20173119977. The next prime is 20173120003. The reversal of 20173120001 is 10002137102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18052609600 + 2120510401 = 134360^2 + 46049^2 .

It is a cyclic number.

It is not a de Polignac number, because 20173120001 - 2³⁴ = 2993250817 is a prime.

Together with 20173120003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20173120003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10086560000 + 10086560001.

It is an arithmetic number, because the mean of its divisors is an integer number (10086560001).

Almost surely, 2^20173120001 is an apocalyptic number.

It is an amenable number.

20173120001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20173120001 is an equidigital number, since it uses as much as digits as its factorization.

20173120001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 17.

Adding to 20173120001 its reverse (10002137102), we get a palindrome (30175257103).

The spelling of 20173120001 in words is "twenty billion, one hundred seventy-three million, one hundred twenty thousand, one".