121516211 has 2 divisors, whose sum is σ = 121516212. Its totient is φ = 121516210.

The previous prime is 121516181. The next prime is 121516217. The reversal of 121516211 is 112615121.

It is a strong prime.

It is an emirp because it is prime and its reverse (112615121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121516211 - 2²⁶ = 54407347 is a prime.

It is not a weakly prime, because it can be changed into another prime (121516217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60758105 + 60758106.

It is an arithmetic number, because the mean of its divisors is an integer number (60758106).

Almost surely, 2^121516211 is an apocalyptic number.

121516211 is a deficient number, since it is larger than the sum of its proper divisors (1).

121516211 is an equidigital number, since it uses as much as digits as its factorization.

121516211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 20.

The square root of 121516211 is about 11023.4391638907. The cubic root of 121516211 is about 495.3111141499.

The spelling of 121516211 in words is "one hundred twenty-one million, five hundred sixteen thousand, two hundred eleven".