121020313 has 4 divisors (see below), whose sum is σ = 121042468. Its totient is φ = 120998160.

The previous prime is 121020307. The next prime is 121020371. The reversal of 121020313 is 313020121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313020121 = 653 ⋅479357.

It can be written as a sum of positive squares in 2 ways, for example, as 56972304 + 64048009 = 7548^2 + 8003^2 .

It is a cyclic number.

It is not a de Polignac number, because 121020313 - 2²⁵ = 87465881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121020293 and 121020302.

It is not an unprimeable number, because it can be changed into a prime (121020113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3595 + ... + 15967.

It is an arithmetic number, because the mean of its divisors is an integer number (30260617).

Almost surely, 2^121020313 is an apocalyptic number.

It is an amenable number.

121020313 is a deficient number, since it is larger than the sum of its proper divisors (22155).

121020313 is an equidigital number, since it uses as much as digits as its factorization.

121020313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22154.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 121020313 is about 11000.9232794343. The cubic root of 121020313 is about 494.6364204275.

Adding to 121020313 its reverse (313020121), we get a palindrome (434040434).

The spelling of 121020313 in words is "one hundred twenty-one million, twenty thousand, three hundred thirteen".