121971 has 8 divisors (see below), whose sum is σ = 164560. Its totient is φ = 80352.

The previous prime is 121967. The next prime is 121993. The reversal of 121971 is 179121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121971 - 2² = 121967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141 + ... + 513.

It is an arithmetic number, because the mean of its divisors is an integer number (20570).

2¹²¹⁹⁷¹ is an apocalyptic number.

121971 is a deficient number, since it is larger than the sum of its proper divisors (42589).

121971 is a wasteful number, since it uses less digits than its factorization.

121971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485.

The product of its digits is 126, while the sum is 21.

The square root of 121971 is about 349.2434680849. The cubic root of 121971 is about 49.5928265293.

The spelling of 121971 in words is "one hundred twenty-one thousand, nine hundred seventy-one".