121212213 has 8 divisors (see below), whose sum is σ = 161928576. Its totient is φ = 80652000.

The previous prime is 121212209. The next prime is 121212253. The reversal of 121212213 is 312212121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121212213 - 2² = 121212209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121212192 and 121212201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37213 + ... + 40338.

It is an arithmetic number, because the mean of its divisors is an integer number (20241072).

Almost surely, 2^121212213 is an apocalyptic number.

It is an amenable number.

121212213 is a deficient number, since it is larger than the sum of its proper divisors (40716363).

121212213 is an equidigital number, since it uses as much as digits as its factorization.

121212213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78075.

The product of its digits is 48, while the sum is 15.

The square root of 121212213 is about 11009.6418197869. The cubic root of 121212213 is about 494.8977280803.

Adding to 121212213 its reverse (312212121), we get a palindrome (433424334).

The spelling of 121212213 in words is "one hundred twenty-one million, two hundred twelve thousand, two hundred thirteen".