121211001020173 has 2 divisors, whose sum is σ = 121211001020174. Its totient is φ = 121211001020172.

The previous prime is 121211001020119. The next prime is 121211001020209. The reversal of 121211001020173 is 371020100112121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75412932819844 + 45798068200329 = 8684062^2 + 6767427^2 .

It is a cyclic number.

It is not a de Polignac number, because 121211001020173 - 2³⁷ = 121073562066701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121211001020273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605500510086 + 60605500510087.

It is an arithmetic number, because the mean of its divisors is an integer number (60605500510087).

Almost surely, 2^{121211001020173} is an apocalyptic number.

It is an amenable number.

121211001020173 is a deficient number, since it is larger than the sum of its proper divisors (1).

121211001020173 is an equidigital number, since it uses as much as digits as its factorization.

121211001020173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 22.

Adding to 121211001020173 its reverse (371020100112121), we get a palindrome (492231101132294).

The spelling of 121211001020173 in words is "one hundred twenty-one trillion, two hundred eleven billion, one million, twenty thousand, one hundred seventy-three".