12031223213 has 4 divisors (see below), whose sum is σ = 12155256540. Its totient is φ = 11907189888.

The previous prime is 12031223209. The next prime is 12031223233. The reversal of 12031223213 is 31232213021.

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 3736021129 + 8295202084 = 61123^2 + 91078^2 .

It is a cyclic number.

It is not a de Polignac number, because 12031223213 - 2² = 12031223209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12031223233) 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, 62016518 + ... + 62016711.

It is an arithmetic number, because the mean of its divisors is an integer number (3038814135).

Almost surely, 2^12031223213 is an apocalyptic number.

It is an amenable number.

12031223213 is a deficient number, since it is larger than the sum of its proper divisors (124033327).

12031223213 is an equidigital number, since it uses as much as digits as its factorization.

12031223213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124033326.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 12031223213 its reverse (31232213021), we get a palindrome (43263436234).

The spelling of 12031223213 in words is "twelve billion, thirty-one million, two hundred twenty-three thousand, two hundred thirteen".