121801763173 has 2 divisors, whose sum is σ = 121801763174. Its totient is φ = 121801763172.

The previous prime is 121801763141. The next prime is 121801763177. The reversal of 121801763173 is 371367108121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69789487329 + 52012275844 = 264177^2 + 228062^2 .

It is a cyclic number.

It is not a de Polignac number, because 121801763173 - 2⁵ = 121801763141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121801763177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60900881586 + 60900881587.

It is an arithmetic number, because the mean of its divisors is an integer number (60900881587).

Almost surely, 2^121801763173 is an apocalyptic number.

It is an amenable number.

121801763173 is a deficient number, since it is larger than the sum of its proper divisors (1).

121801763173 is an equidigital number, since it uses as much as digits as its factorization.

121801763173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 40.

The spelling of 121801763173 in words is "one hundred twenty-one billion, eight hundred one million, seven hundred sixty-three thousand, one hundred seventy-three".