321512113 has 4 divisors (see below), whose sum is σ = 346243828. Its totient is φ = 296780400.

The previous prime is 321512099. The next prime is 321512117. The reversal of 321512113 is 311215123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 311215123 = 43 ⋅7237561.

It can be written as a sum of positive squares in 2 ways, for example, as 98069409 + 223442704 = 9903^2 + 14948^2 .

It is a cyclic number.

It is not a de Polignac number, because 321512113 - 2⁹ = 321511601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321512117) 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, 12365838 + ... + 12365863.

It is an arithmetic number, because the mean of its divisors is an integer number (86560957).

Almost surely, 2^321512113 is an apocalyptic number.

It is an amenable number.

321512113 is a deficient number, since it is larger than the sum of its proper divisors (24731715).

321512113 is a wasteful number, since it uses less digits than its factorization.

321512113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24731714.

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

The square root of 321512113 is about 17930.7588517608. The cubic root of 321512113 is about 685.0660514921.

Adding to 321512113 its reverse (311215123), we get a palindrome (632727236).

The spelling of 321512113 in words is "three hundred twenty-one million, five hundred twelve thousand, one hundred thirteen".