231204402133 has 4 divisors (see below), whose sum is σ = 244804661100. Its totient is φ = 217604143168.

The previous prime is 231204402103. The next prime is 231204402157. The reversal of 231204402133 is 331204402132.

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 194214727204 + 36989674929 = 440698^2 + 192327^2 .

It is a cyclic number.

It is not a de Polignac number, because 231204402133 - 2²⁹ = 230667531221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231204402098 and 231204402107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231204402103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6800129458 + ... + 6800129491.

It is an arithmetic number, because the mean of its divisors is an integer number (61201165275).

Almost surely, 2^231204402133 is an apocalyptic number.

It is an amenable number.

231204402133 is a deficient number, since it is larger than the sum of its proper divisors (13600258967).

231204402133 is a wasteful number, since it uses less digits than its factorization.

231204402133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13600258966.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 231204402133 its reverse (331204402132), we get a palindrome (562408804265).

Subtracting 231204402133 from its reverse (331204402132), we obtain a palindrome (99999999999).

The spelling of 231204402133 in words is "two hundred thirty-one billion, two hundred four million, four hundred two thousand, one hundred thirty-three".