231312221201 has 4 divisors (see below), whose sum is σ = 231313212900. Its totient is φ = 231311229504.

The previous prime is 231312221167. The next prime is 231312221209. The reversal of 231312221201 is 102122213132.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 124481952400 + 106830268801 = 352820^2 + 326849^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231312221201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231312221209) 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 3 ways as a sum of consecutive naturals, for example, 66965 + ... + 683453.

It is an arithmetic number, because the mean of its divisors is an integer number (57828303225).

Almost surely, 2^231312221201 is an apocalyptic number.

It is an amenable number.

231312221201 is a deficient number, since it is larger than the sum of its proper divisors (991699).

231312221201 is an equidigital number, since it uses as much as digits as its factorization.

231312221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991698.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 231312221201 its reverse (102122213132), we get a palindrome (333434434333).

The spelling of 231312221201 in words is "two hundred thirty-one billion, three hundred twelve million, two hundred twenty-one thousand, two hundred one".