121131213 has 16 divisors (see below), whose sum is σ = 194296320. Its totient is φ = 65574576.

The previous prime is 121131211. The next prime is 121131217. The reversal of 121131213 is 312131121.

It is a happy number.

It is not a de Polignac number, because 121131213 - 2¹ = 121131211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121131192 and 121131201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121131211) 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 15 ways as a sum of consecutive naturals, for example, 151395 + ... + 152192.

It is an arithmetic number, because the mean of its divisors is an integer number (12143520).

Almost surely, 2^121131213 is an apocalyptic number.

It is an amenable number.

121131213 is a deficient number, since it is larger than the sum of its proper divisors (73165107).

121131213 is a wasteful number, since it uses less digits than its factorization.

121131213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303616.

The product of its digits is 36, while the sum is 15.

The square root of 121131213 is about 11005.9626112394. The cubic root of 121131213 is about 494.7874651302.

Adding to 121131213 its reverse (312131121), we get a palindrome (433262334).

The spelling of 121131213 in words is "one hundred twenty-one million, one hundred thirty-one thousand, two hundred thirteen".