231321030013 has 4 divisors (see below), whose sum is σ = 235113178108. Its totient is φ = 227528881920.

The previous prime is 231321029983. The next prime is 231321030019. The reversal of 231321030013 is 310030123132.

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 37124811684 + 194196218329 = 192678^2 + 440677^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231321030013 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 (231321030019) 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, 1896073956 + ... + 1896074077.

It is an arithmetic number, because the mean of its divisors is an integer number (58778294527).

Almost surely, 2^231321030013 is an apocalyptic number.

It is an amenable number.

231321030013 is a deficient number, since it is larger than the sum of its proper divisors (3792148095).

231321030013 is an equidigital number, since it uses as much as digits as its factorization.

231321030013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3792148094.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 231321030013 its reverse (310030123132), we get a palindrome (541351153145).

The spelling of 231321030013 in words is "two hundred thirty-one billion, three hundred twenty-one million, thirty thousand, thirteen".