121204345 has 4 divisors (see below), whose sum is σ = 145445220. Its totient is φ = 96963472.

The previous prime is 121204337. The next prime is 121204351. The reversal of 121204345 is 543402121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543402121 = 71 ⋅7653551.

It can be written as a sum of positive squares in 2 ways, for example, as 36711481 + 84492864 = 6059^2 + 9192^2 .

It is a cyclic number.

It is not a de Polignac number, because 121204345 - 2³ = 121204337 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12120430 + ... + 12120439.

It is an arithmetic number, because the mean of its divisors is an integer number (36361305).

Almost surely, 2^121204345 is an apocalyptic number.

It is an amenable number.

121204345 is a deficient number, since it is larger than the sum of its proper divisors (24240875).

121204345 is an equidigital number, since it uses as much as digits as its factorization.

121204345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24240874.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 121204345 is about 11009.2844908286. The cubic root of 121204345 is about 494.8870197546.

Adding to 121204345 its reverse (543402121), we get a palindrome (664606466).

The spelling of 121204345 in words is "one hundred twenty-one million, two hundred four thousand, three hundred forty-five".