121521017 has 8 divisors (see below), whose sum is σ = 128220960. Its totient is φ = 114851520.

The previous prime is 121521013. The next prime is 121521067. The reversal of 121521017 is 710125121.

It is a happy number.

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 121521017 - 2² = 121521013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121521017.

It is not an unprimeable number, because it can be changed into a prime (121521013) 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, 842 + ... + 15612.

It is an arithmetic number, because the mean of its divisors is an integer number (16027620).

Almost surely, 2^121521017 is an apocalyptic number.

It is an amenable number.

121521017 is a deficient number, since it is larger than the sum of its proper divisors (6699943).

121521017 is a wasteful number, since it uses less digits than its factorization.

121521017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15223.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 121521017 is about 11023.6571517804. The cubic root of 121521017 is about 495.3176439613.

Adding to 121521017 its reverse (710125121), we get a palindrome (831646138).

The spelling of 121521017 in words is "one hundred twenty-one million, five hundred twenty-one thousand, seventeen".