121303313 has 4 divisors (see below), whose sum is σ = 128438820. Its totient is φ = 114167808.

The previous prime is 121303307. The next prime is 121303321. The reversal of 121303313 is 313303121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48832144 + 72471169 = 6988^2 + 8513^2 .

It is a cyclic number.

It is not a de Polignac number, because 121303313 - 2²⁶ = 54194449 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 7135489 = 121303313 / (1 + 2 + 1 + 3 + 0 + 3 + 3 + 1 + 3).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121303291 and 121303300.

It is not an unprimeable number, because it can be changed into a prime (121303333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3567728 + ... + 3567761.

It is an arithmetic number, because the mean of its divisors is an integer number (32109705).

Almost surely, 2^121303313 is an apocalyptic number.

It is an amenable number.

121303313 is a deficient number, since it is larger than the sum of its proper divisors (7135507).

121303313 is an equidigital number, since it uses as much as digits as its factorization.

121303313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7135506.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 121303313 is about 11013.7783253523. The cubic root of 121303313 is about 495.0216811916.

Adding to 121303313 its reverse (313303121), we get a palindrome (434606434).

The spelling of 121303313 in words is "one hundred twenty-one million, three hundred three thousand, three hundred thirteen".