121317521 has 8 divisors (see below), whose sum is σ = 130999680. Its totient is φ = 111685392.

The previous prime is 121317517. The next prime is 121317523. The reversal of 121317521 is 125713121.

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

It is not a de Polignac number, because 121317521 - 2² = 121317517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121317523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7385 + ... + 17238.

It is an arithmetic number, because the mean of its divisors is an integer number (16374960).

Almost surely, 2^121317521 is an apocalyptic number.

It is an amenable number.

121317521 is a deficient number, since it is larger than the sum of its proper divisors (9682159).

121317521 is a wasteful number, since it uses less digits than its factorization.

121317521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25015.

The product of its digits is 420, while the sum is 23.

The square root of 121317521 is about 11014.4233167243. The cubic root of 121317521 is about 495.0410073839.

The spelling of 121317521 in words is "one hundred twenty-one million, three hundred seventeen thousand, five hundred twenty-one".