12021213 has 4 divisors (see below), whose sum is σ = 16028288. Its totient is φ = 8014140.

The previous prime is 12021187. The next prime is 12021259. The reversal of 12021213 is 31212021.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31212021 = 3 ⋅10404007.

It is not a de Polignac number, because 12021213 - 2¹³ = 12013021 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 (12021013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2003533 + ... + 2003538.

It is an arithmetic number, because the mean of its divisors is an integer number (4007072).

Almost surely, 2^12021213 is an apocalyptic number.

It is an amenable number.

12021213 is a deficient number, since it is larger than the sum of its proper divisors (4007075).

12021213 is an equidigital number, since it uses as much as digits as its factorization.

12021213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4007074.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 12021213 is about 3467.1620960088. The cubic root of 12021213 is about 229.0776736696.

Adding to 12021213 its reverse (31212021), we get a palindrome (43233234).

It can be divided in two parts, 1202 and 1213, that added together give a triangular number (2415 = T₆₉).

The spelling of 12021213 in words is "twelve million, twenty-one thousand, two hundred thirteen".