121798 has 4 divisors (see below), whose sum is σ = 182700. Its totient is φ = 60898.

The previous prime is 121789. The next prime is 121843. The reversal of 121798 is 897121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 897121 = 41 ⋅21881.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 30448 + ... + 30451.

It is an arithmetic number, because the mean of its divisors is an integer number (45675).

2¹²¹⁷⁹⁸ is an apocalyptic number.

121798 is a deficient number, since it is larger than the sum of its proper divisors (60902).

121798 is an equidigital number, since it uses as much as digits as its factorization.

121798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60901.

The product of its digits is 1008, while the sum is 28.

The square root of 121798 is about 348.9957019793. The cubic root of 121798 is about 49.5693684436.

It can be divided in two parts, 121 and 798, that added together give a palindrome (919).

The spelling of 121798 in words is "one hundred twenty-one thousand, seven hundred ninety-eight".