121838 has 4 divisors (see below), whose sum is σ = 182760. Its totient is φ = 60918.

The previous prime is 121789. The next prime is 121843. The reversal of 121838 is 838121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 838121 = 113 ⋅7417.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30458 + ... + 30461.

It is an arithmetic number, because the mean of its divisors is an integer number (45690).

2¹²¹⁸³⁸ is an apocalyptic number.

121838 is a deficient number, since it is larger than the sum of its proper divisors (60922).

121838 is an equidigital number, since it uses as much as digits as its factorization.

121838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60921.

The product of its digits is 384, while the sum is 23.

The square root of 121838 is about 349.0530045709. The cubic root of 121838 is about 49.5747942517.

Adding to 121838 its reverse (838121), we get a palindrome (959959).

It can be divided in two parts, 121 and 838, that added together give a palindrome (959).

The spelling of 121838 in words is "one hundred twenty-one thousand, eight hundred thirty-eight".