121211000171 has 2 divisors, whose sum is σ = 121211000172. Its totient is φ = 121211000170.

The previous prime is 121211000117. The next prime is 121211000173. The reversal of 121211000171 is 171000112121.

Together with previous prime (121211000117) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121211000171 - 2¹⁸ = 121210738027 is a prime.

It is a Sophie Germain prime.

Together with 121211000173, 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 (121211000173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605500085 + 60605500086.

It is an arithmetic number, because the mean of its divisors is an integer number (60605500086).

Almost surely, 2^121211000171 is an apocalyptic number.

121211000171 is a deficient number, since it is larger than the sum of its proper divisors (1).

121211000171 is an equidigital number, since it uses as much as digits as its factorization.

121211000171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 17.

Adding to 121211000171 its reverse (171000112121), we get a palindrome (292211112292).

The spelling of 121211000171 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred seventy-one", and thus it is an aban number.