1212213 has 8 divisors (see below), whose sum is σ = 1654048.
Its totient is φ = 789264.
The previous prime is 1212199. The next prime is 1212221. The reversal of 1212213 is 3122121.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 1212213 - 26 = 1212149 is a prime.
It is an Ulam number.
It is a Duffinian number.
It is a Curzon number.
1212213 is a lucky number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1212283) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4570 + ... + 4827.
It is an arithmetic number, because the mean of its divisors is an integer number (206756).
21212213 is an apocalyptic number.
It is an amenable number.
1212213 is a deficient number, since it is larger than the sum of its proper divisors (441835).
1212213 is an equidigital number, since it uses as much as digits as its factorization.
1212213 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 9443.
The product of its digits is 24, while the sum is 12.
The square root of 1212213 is about 1101.0054495778.
The cubic root of 1212213 is about 106.6251476867.
Subtracting from 1212213 its sum of digits (12), we obtain a square (1212201 = 11012).
Adding to 1212213 its reverse (3122121), we get a palindrome (4334334).
The spelling of 1212213 in words is "one million, two hundred twelve thousand, two hundred thirteen".