121823 has 4 divisors (see below), whose sum is σ = 131208. Its totient is φ = 112440.

The previous prime is 121789. The next prime is 121843. The reversal of 121823 is 328121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121823 - 2¹² = 117727 is a prime.

It is a Duffinian number.

It is a plaindrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121843) 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, 4673 + ... + 4698.

It is an arithmetic number, because the mean of its divisors is an integer number (32802).

2¹²¹⁸²³ is an apocalyptic number.

121823 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121823 is a deficient number, since it is larger than the sum of its proper divisors (9385).

121823 is an equidigital number, since it uses as much as digits as its factorization.

121823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9384.

The product of its digits is 96, while the sum is 17.

The square root of 121823 is about 349.0315172015. The cubic root of 121823 is about 49.5727597129.

Adding to 121823 its reverse (328121), we get a palindrome (449944).

The spelling of 121823 in words is "one hundred twenty-one thousand, eight hundred twenty-three".