121505321 has 16 divisors (see below), whose sum is σ = 140958720. Its totient is φ = 102589200.

The previous prime is 121505303. The next prime is 121505333. The reversal of 121505321 is 123505121.

It is a happy number.

It is not a de Polignac number, because 121505321 - 2⁶ = 121505257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121505293 and 121505302.

It is not an unprimeable number, because it can be changed into a prime (121505821) 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 15 ways as a sum of consecutive naturals, for example, 146510 + ... + 147336.

It is an arithmetic number, because the mean of its divisors is an integer number (8809920).

Almost surely, 2^121505321 is an apocalyptic number.

It is an amenable number.

121505321 is a deficient number, since it is larger than the sum of its proper divisors (19453399).

121505321 is a wasteful number, since it uses less digits than its factorization.

121505321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 121505321 is about 11022.9452053433. The cubic root of 121505321 is about 495.2963174982.

It can be divided in two parts, 12150 and 5321, that added together give a palindrome (17471).

The spelling of 121505321 in words is "one hundred twenty-one million, five hundred five thousand, three hundred twenty-one".