121871 has 4 divisors (see below), whose sum is σ = 124512. Its totient is φ = 119232.

The previous prime is 121867. The next prime is 121883. The reversal of 121871 is 178121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178121 = 59 ⋅3019.

It is a cyclic number.

It is not a de Polignac number, because 121871 - 2² = 121867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121171) 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, 1250 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (31128).

2¹²¹⁸⁷¹ is an apocalyptic number.

121871 is a deficient number, since it is larger than the sum of its proper divisors (2641).

121871 is an equidigital number, since it uses as much as digits as its factorization.

121871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640.

The product of its digits is 112, while the sum is 20.

The square root of 121871 is about 349.1002721282. The cubic root of 121871 is about 49.5792696495.

Adding to 121871 its reverse (178121), we get a palindrome (299992).

The spelling of 121871 in words is "one hundred twenty-one thousand, eight hundred seventy-one".