121302505 has 8 divisors (see below), whose sum is σ = 150582600. Its totient is φ = 93695616.

The previous prime is 121302499. The next prime is 121302509. The reversal of 121302505 is 505203121.

It can be written as a sum of positive squares in 4 ways, for example, as 32867289 + 88435216 = 5733^2 + 9404^2 .

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 121302505 - 2¹⁷ = 121171433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121302509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418140 + ... + 418429.

It is an arithmetic number, because the mean of its divisors is an integer number (18822825).

Almost surely, 2^121302505 is an apocalyptic number.

It is an amenable number.

121302505 is a deficient number, since it is larger than the sum of its proper divisors (29280095).

121302505 is an equidigital number, since it uses as much as digits as its factorization.

121302505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836603.

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

The square root of 121302505 is about 11013.7416439646. The cubic root of 121302505 is about 495.0205820779.

Adding to 121302505 its reverse (505203121), we get a palindrome (626505626).

The spelling of 121302505 in words is "one hundred twenty-one million, three hundred two thousand, five hundred five".