121255 has 4 divisors (see below), whose sum is σ = 145512. Its totient is φ = 97000.

The previous prime is 121229. The next prime is 121259. The reversal of 121255 is 552121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 552121 = 19 ⋅29059.

It is not a de Polignac number, because 121255 - 2¹³ = 113063 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121259) 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 3 ways as a sum of consecutive naturals, for example, 12121 + ... + 12130.

It is an arithmetic number, because the mean of its divisors is an integer number (36378).

2¹²¹²⁵⁵ is an apocalyptic number.

121255 is a deficient number, since it is larger than the sum of its proper divisors (24257).

121255 is an equidigital number, since it uses as much as digits as its factorization.

121255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24256.

The product of its digits is 100, while the sum is 16.

The square root of 121255 is about 348.2168864372. The cubic root of 121255 is about 49.4955952956.

Adding to 121255 its reverse (552121), we get a palindrome (673376).

The spelling of 121255 in words is "one hundred twenty-one thousand, two hundred fifty-five".