231212310133 has 4 divisors (see below), whose sum is σ = 264242640160. Its totient is φ = 198181980108.

The previous prime is 231212310103. The next prime is 231212310157. The reversal of 231212310133 is 331013212132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 231212310133 - 2¹³ = 231212301941 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 (231212310103) 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, 16515165003 + ... + 16515165016.

It is an arithmetic number, because the mean of its divisors is an integer number (66060660040).

Almost surely, 2^231212310133 is an apocalyptic number.

It is an amenable number.

231212310133 is a deficient number, since it is larger than the sum of its proper divisors (33030330027).

231212310133 is an equidigital number, since it uses as much as digits as its factorization.

231212310133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33030330026.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 231212310133 its reverse (331013212132), we get a palindrome (562225522265).

The spelling of 231212310133 in words is "two hundred thirty-one billion, two hundred twelve million, three hundred ten thousand, one hundred thirty-three".