231221112013 has 8 divisors (see below), whose sum is σ = 235083671936. Its totient is φ = 227360876400.

The previous prime is 231221111987. The next prime is 231221112037. The reversal of 231221112013 is 310211122132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231221112013 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 (231221112043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379881 + ... + 778942.

It is an arithmetic number, because the mean of its divisors is an integer number (29385458992).

Almost surely, 2^231221112013 is an apocalyptic number.

It is an amenable number.

231221112013 is a deficient number, since it is larger than the sum of its proper divisors (3862559923).

231221112013 is a wasteful number, since it uses less digits than its factorization.

231221112013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162155.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 231221112013 its reverse (310211122132), we get a palindrome (541432234145).

The spelling of 231221112013 in words is "two hundred thirty-one billion, two hundred twenty-one million, one hundred twelve thousand, thirteen".