121312171 has 2 divisors, whose sum is σ = 121312172. Its totient is φ = 121312170.

The previous prime is 121312151. The next prime is 121312181. The reversal of 121312171 is 171213121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121312171 - 2⁷ = 121312043 is a prime.

It is not a weakly prime, because it can be changed into another prime (121312141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60656085 + 60656086.

It is an arithmetic number, because the mean of its divisors is an integer number (60656086).

Almost surely, 2^121312171 is an apocalyptic number.

121312171 is a deficient number, since it is larger than the sum of its proper divisors (1).

121312171 is an equidigital number, since it uses as much as digits as its factorization.

121312171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84, while the sum is 19.

The square root of 121312171 is about 11014.1804506736. The cubic root of 121312171 is about 495.0337303138.

Adding to 121312171 its reverse (171213121), we get a palindrome (292525292).

The spelling of 121312171 in words is "one hundred twenty-one million, three hundred twelve thousand, one hundred seventy-one".