121673 has 4 divisors (see below), whose sum is σ = 122388. Its totient is φ = 120960.

The previous prime is 121661. The next prime is 121687. The reversal of 121673 is 376121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 376121 = 43 ⋅8747.

It can be written as a sum of positive squares in 2 ways, for example, as 44944 + 76729 = 212^2 + 277^2 .

It is a cyclic number.

It is not a de Polignac number, because 121673 - 2⁶ = 121609 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 (121633) 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, 65 + ... + 497.

It is an arithmetic number, because the mean of its divisors is an integer number (30597).

2¹²¹⁶⁷³ is an apocalyptic number.

It is an amenable number.

121673 is a deficient number, since it is larger than the sum of its proper divisors (715).

121673 is an equidigital number, since it uses as much as digits as its factorization.

121673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714.

The product of its digits is 252, while the sum is 20.

The square root of 121673 is about 348.8165707073. The cubic root of 121673 is about 49.5524051329.

Adding to 121673 its reverse (376121), we get a palindrome (497794).

The spelling of 121673 in words is "one hundred twenty-one thousand, six hundred seventy-three".