20123130000173 has 2 divisors, whose sum is σ = 20123130000174. Its totient is φ = 20123130000172.

The previous prime is 20123130000163. The next prime is 20123130000179. The reversal of 20123130000173 is 37100003132102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20050352528644 + 72777471529 = 4477762^2 + 269773^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123130000173 - 2²² = 20123125805869 is a prime.

It is a super-2 number, since 2×20123130000173² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123130000179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061565000086 + 10061565000087.

It is an arithmetic number, because the mean of its divisors is an integer number (10061565000087).

Almost surely, 2^{20123130000173} is an apocalyptic number.

It is an amenable number.

20123130000173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123130000173 is an equidigital number, since it uses as much as digits as its factorization.

20123130000173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 23.

Adding to 20123130000173 its reverse (37100003132102), we get a palindrome (57223133132275).

The spelling of 20123130000173 in words is "twenty trillion, one hundred twenty-three billion, one hundred thirty million, one hundred seventy-three", and thus it is an aban number.