12031213 has 4 divisors (see below), whose sum is σ = 12228508. Its totient is φ = 11833920.

The previous prime is 12031211. The next prime is 12031219. The reversal of 12031213 is 31213021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31213021 = 7 ⋅4459003.

It can be written as a sum of positive squares in 2 ways, for example, as 4313929 + 7717284 = 2077^2 + 2778^2 .

It is a cyclic number.

It is not a de Polignac number, because 12031213 - 2¹ = 12031211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12031193 and 12031202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12031211) 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, 98556 + ... + 98677.

It is an arithmetic number, because the mean of its divisors is an integer number (3057127).

Almost surely, 2^12031213 is an apocalyptic number.

It is an amenable number.

12031213 is a deficient number, since it is larger than the sum of its proper divisors (197295).

12031213 is an equidigital number, since it uses as much as digits as its factorization.

12031213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197294.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 12031213 is about 3468.6038978240. The cubic root of 12031213 is about 229.1411764633.

Adding to 12031213 its reverse (31213021), we get a palindrome (43244234).

The spelling of 12031213 in words is "twelve million, thirty-one thousand, two hundred thirteen".