121345 has 8 divisors (see below), whose sum is σ = 166464. Its totient is φ = 83184.

The previous prime is 121343. The next prime is 121349. The reversal of 121345 is 543121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121345 - 2¹ = 121343 is a prime.

It is a Duffinian number.

121345 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (121343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1699 + ... + 1768.

It is an arithmetic number, because the mean of its divisors is an integer number (20808).

It is a Proth number, since it is equal to 237 ⋅ 2⁹ + 1 and 237 < 2⁹.

2¹²¹³⁴⁵ is an apocalyptic number.

It is an amenable number.

121345 is a deficient number, since it is larger than the sum of its proper divisors (45119).

121345 is an equidigital number, since it uses as much as digits as its factorization.

121345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3479.

The product of its digits is 120, while the sum is 16.

The square root of 121345 is about 348.3460922703. The cubic root of 121345 is about 49.5078380949.

Adding to 121345 its reverse (543121), we get a palindrome (664466).

The spelling of 121345 in words is "one hundred twenty-one thousand, three hundred forty-five".