121342505 has 4 divisors (see below), whose sum is σ = 145611012. Its totient is φ = 97074000.

The previous prime is 121342483. The next prime is 121342519. The reversal of 121342505 is 505243121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505243121 = 89 ⋅5676889.

It can be written as a sum of positive squares in 2 ways, for example, as 95981209 + 25361296 = 9797^2 + 5036^2 .

It is not a de Polignac number, because 121342505 - 2²⁴ = 104565289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12134246 + ... + 12134255.

It is an arithmetic number, because the mean of its divisors is an integer number (36402753).

Almost surely, 2^121342505 is an apocalyptic number.

It is an amenable number.

121342505 is a deficient number, since it is larger than the sum of its proper divisors (24268507).

121342505 is an equidigital number, since it uses as much as digits as its factorization.

121342505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24268506.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 121342505 is about 11015.5574075940. The cubic root of 121342505 is about 495.0749877892.

Adding to 121342505 its reverse (505243121), we get a palindrome (626585626).

The spelling of 121342505 in words is "one hundred twenty-one million, three hundred forty-two thousand, five hundred five".