121315213 has 8 divisors (see below), whose sum is σ = 128624760. Its totient is φ = 114024960.

The previous prime is 121315211. The next prime is 121315219. The reversal of 121315213 is 312513121.

It can be written as a sum of positive squares in 4 ways, for example, as 65334889 + 55980324 = 8083^2 + 7482^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121315213 - 2¹ = 121315211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121315211) 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 7 ways as a sum of consecutive naturals, for example, 9343 + ... + 18163.

It is an arithmetic number, because the mean of its divisors is an integer number (16078095).

Almost surely, 2^121315213 is an apocalyptic number.

It is an amenable number.

121315213 is a deficient number, since it is larger than the sum of its proper divisors (7309547).

121315213 is an equidigital number, since it uses as much as digits as its factorization.

121315213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9647.

The product of its digits is 180, while the sum is 19.

The square root of 121315213 is about 11014.3185445129. The cubic root of 121315213 is about 495.0378680685.

Adding to 121315213 its reverse (312513121), we get a palindrome (433828334).

The spelling of 121315213 in words is "one hundred twenty-one million, three hundred fifteen thousand, two hundred thirteen".