121020171 has 4 divisors (see below), whose sum is σ = 161360232. Its totient is φ = 80680112.

The previous prime is 121020167. The next prime is 121020173. The reversal of 121020171 is 171020121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121020171 - 2² = 121020167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121020171.

It is not an unprimeable number, because it can be changed into a prime (121020173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20170026 + ... + 20170031.

It is an arithmetic number, because the mean of its divisors is an integer number (40340058).

Almost surely, 2^121020171 is an apocalyptic number.

121020171 is a deficient number, since it is larger than the sum of its proper divisors (40340061).

121020171 is an equidigital number, since it uses as much as digits as its factorization.

121020171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40340060.

The product of its (nonzero) digits is 28, while the sum is 15.

The square root of 121020171 is about 11000.9168254287. The cubic root of 121020171 is about 494.6362269658.

Adding to 121020171 its reverse (171020121), we get a palindrome (292040292).

The spelling of 121020171 in words is "one hundred twenty-one million, twenty thousand, one hundred seventy-one".