121320505 has 4 divisors (see below), whose sum is σ = 145584612. Its totient is φ = 97056400.

The previous prime is 121320481. The next prime is 121320523. The reversal of 121320505 is 505023121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505023121 = 23 ⋅21957527.

It can be written as a sum of positive squares in 2 ways, for example, as 23785129 + 97535376 = 4877^2 + 9876^2 .

It is not a de Polignac number, because 121320505 - 2¹⁵ = 121287737 is a prime.

It is a Duffinian 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, 12132046 + ... + 12132055.

It is an arithmetic number, because the mean of its divisors is an integer number (36396153).

Almost surely, 2^121320505 is an apocalyptic number.

It is an amenable number.

121320505 is a deficient number, since it is larger than the sum of its proper divisors (24264107).

121320505 is an equidigital number, since it uses as much as digits as its factorization.

121320505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24264106.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 121320505 is about 11014.5587746400. The cubic root of 121320505 is about 495.0450661279.

Adding to 121320505 its reverse (505023121), we get a palindrome (626343626).

The spelling of 121320505 in words is "one hundred twenty-one million, three hundred twenty thousand, five hundred five".