20110101173 has 2 divisors, whose sum is σ = 20110101174. Its totient is φ = 20110101172.

The previous prime is 20110101113. The next prime is 20110101181. The reversal of 20110101173 is 37110101102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12751378084 + 7358723089 = 112922^2 + 85783^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110101173 - 2¹⁴ = 20110084789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110101103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055050586 + 10055050587.

It is an arithmetic number, because the mean of its divisors is an integer number (10055050587).

Almost surely, 2^20110101173 is an apocalyptic number.

It is an amenable number.

20110101173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110101173 is an equidigital number, since it uses as much as digits as its factorization.

20110101173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42, while the sum is 17.

Adding to 20110101173 its reverse (37110101102), we get a palindrome (57220202275).

The spelling of 20110101173 in words is "twenty billion, one hundred ten million, one hundred one thousand, one hundred seventy-three".