231220033133 has 4 divisors (see below), whose sum is σ = 232042880508. Its totient is φ = 230397185760.

The previous prime is 231220033129. The next prime is 231220033153. The reversal of 231220033133 is 331330022132.

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 142584025609 + 88636007524 = 377603^2 + 297718^2 .

It is a cyclic number.

It is not a de Polignac number, because 231220033133 - 2² = 231220033129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231220033099 and 231220033108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231220033103) 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, 411423266 + ... + 411423827.

It is an arithmetic number, because the mean of its divisors is an integer number (58010720127).

Almost surely, 2^231220033133 is an apocalyptic number.

It is an amenable number.

231220033133 is a deficient number, since it is larger than the sum of its proper divisors (822847375).

231220033133 is an equidigital number, since it uses as much as digits as its factorization.

231220033133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822847374.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 231220033133 its reverse (331330022132), we get a palindrome (562550055265).

The spelling of 231220033133 in words is "two hundred thirty-one billion, two hundred twenty million, thirty-three thousand, one hundred thirty-three".