231230331121213 has 4 divisors (see below), whose sum is σ = 231371583615900. Its totient is φ = 231089078626528.

The previous prime is 231230331121201. The next prime is 231230331121243. The reversal of 231230331121213 is 312121133032132.

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 26805905663364 + 204424425457849 = 5177442^2 + 14297707^2 .

It is a cyclic number.

It is not a de Polignac number, because 231230331121213 - 2³⁷ = 231092892167741 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 (231230331121243) 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, 70626244888 + ... + 70626248161.

It is an arithmetic number, because the mean of its divisors is an integer number (57842895903975).

Almost surely, 2^{231230331121213} is an apocalyptic number.

It is an amenable number.

231230331121213 is a deficient number, since it is larger than the sum of its proper divisors (141252494687).

231230331121213 is a wasteful number, since it uses less digits than its factorization.

231230331121213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141252494686.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 231230331121213 its reverse (312121133032132), we get a palindrome (543351464153345).

The spelling of 231230331121213 in words is "two hundred thirty-one trillion, two hundred thirty billion, three hundred thirty-one million, one hundred twenty-one thousand, two hundred thirteen".