121131211 has 2 divisors, whose sum is σ = 121131212. Its totient is φ = 121131210.

The previous prime is 121131209. The next prime is 121131217. The reversal of 121131211 is 112131121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (112131121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121131211 - 2¹ = 121131209 is a prime.

Together with 121131209, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 121131191 and 121131200.

It is not a weakly prime, because it can be changed into another prime (121131217) 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 as a sum of consecutive naturals, namely, 60565605 + 60565606.

It is an arithmetic number, because the mean of its divisors is an integer number (60565606).

Almost surely, 2^121131211 is an apocalyptic number.

121131211 is a deficient number, since it is larger than the sum of its proper divisors (1).

121131211 is an equidigital number, since it uses as much as digits as its factorization.

121131211 is an odious number, because the sum of its binary digits is odd.

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

The square root of 121131211 is about 11005.9625203796. The cubic root of 121131211 is about 494.7874624070.

Adding to 121131211 its reverse (112131121), we get a palindrome (233262332).

The spelling of 121131211 in words is "one hundred twenty-one million, one hundred thirty-one thousand, two hundred eleven".