121973 has 4 divisors (see below), whose sum is σ = 122688. Its totient is φ = 121260.

The previous prime is 121967. The next prime is 121993. The reversal of 121973 is 379121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 379121 = 79 ⋅4799.

It is a cyclic number.

It is not a de Polignac number, because 121973 - 2⁶ = 121909 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 (121963) 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, 68 + ... + 498.

It is an arithmetic number, because the mean of its divisors is an integer number (30672).

2¹²¹⁹⁷³ is an apocalyptic number.

It is an amenable number.

121973 is a deficient number, since it is larger than the sum of its proper divisors (715).

121973 is an equidigital number, since it uses as much as digits as its factorization.

121973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714.

The product of its digits is 378, while the sum is 23.

The square root of 121973 is about 349.2463314052. The cubic root of 121973 is about 49.5930975914.

The spelling of 121973 in words is "one hundred twenty-one thousand, nine hundred seventy-three".