121111213 has 8 divisors (see below), whose sum is σ = 129055032. Its totient is φ = 113258496.

The previous prime is 121111189. The next prime is 121111231. The reversal of 121111213 is 312111121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24029604 + 97081609 = 4902^2 + 9853^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 121111213 - 2⁹ = 121110701 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121111193 and 121111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111273) 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, 20020 + ... + 25357.

It is an arithmetic number, because the mean of its divisors is an integer number (16131879).

Almost surely, 2^121111213 is an apocalyptic number.

It is an amenable number.

121111213 is a deficient number, since it is larger than the sum of its proper divisors (7943819).

121111213 is a wasteful number, since it uses less digits than its factorization.

121111213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45551.

The product of its digits is 12, while the sum is 13.

The square root of 121111213 is about 11005.0539753333. The cubic root of 121111213 is about 494.7602321439.

Adding to 121111213 its reverse (312111121), we get a palindrome (433222334).

It can be divided in two parts, 12111121 and 3, that multiplied together give a palindrome (36333363).

The spelling of 121111213 in words is "one hundred twenty-one million, one hundred eleven thousand, two hundred thirteen".