121503321 has 10 divisors (see below), whose sum is σ = 181505082. Its totient is φ = 81002160.

The previous prime is 121503299. The next prime is 121503323. The reversal of 121503321 is 123305121.

It can be written as a sum of positive squares in only one way, i.e., 65028096 + 56475225 = 8064^2 + 7515^2 .

It is not a de Polignac number, because 121503321 - 2⁵ = 121503289 is a prime.

121503321 is a modest number, since divided by 3321 gives 1215 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 121503294 and 121503303.

It is not an unprimeable number, because it can be changed into a prime (121503323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 749940 + ... + 750101.

Almost surely, 2^121503321 is an apocalyptic number.

It is an amenable number.

121503321 is a deficient number, since it is larger than the sum of its proper divisors (60001761).

121503321 is an equidigital number, since it uses as much as digits as its factorization.

121503321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500053 (or 1500044 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 121503321 is about 11022.8544851141. The cubic root of 121503321 is about 495.2935999270.

Adding to 121503321 its reverse (123305121), we get a palindrome (244808442).

The spelling of 121503321 in words is "one hundred twenty-one million, five hundred three thousand, three hundred twenty-one".