121213313 has 4 divisors (see below), whose sum is σ = 130537428. Its totient is φ = 111889200.

The previous prime is 121213307. The next prime is 121213321. The reversal of 121213313 is 313312121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313312121 = 9277 ⋅33773.

It can be written as a sum of positive squares in 2 ways, for example, as 19465744 + 101747569 = 4412^2 + 10087^2 .

It is a cyclic number.

It is not a de Polignac number, because 121213313 - 2⁴ = 121213297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121213291 and 121213300.

It is not an unprimeable number, because it can be changed into a prime (121213303) 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, 4662038 + ... + 4662063.

It is an arithmetic number, because the mean of its divisors is an integer number (32634357).

Almost surely, 2^121213313 is an apocalyptic number.

121213313 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

121213313 is a deficient number, since it is larger than the sum of its proper divisors (9324115).

121213313 is an equidigital number, since it uses as much as digits as its factorization.

121213313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9324114.

The product of its digits is 108, while the sum is 17.

The square root of 121213313 is about 11009.6917758855. The cubic root of 121213313 is about 494.8992251403.

Adding to 121213313 its reverse (313312121), we get a palindrome (434525434).

The spelling of 121213313 in words is "one hundred twenty-one million, two hundred thirteen thousand, three hundred thirteen".