121870211 has 2 divisors, whose sum is σ = 121870212. Its totient is φ = 121870210.

The previous prime is 121870159. The next prime is 121870247. The reversal of 121870211 is 112078121.

It is a strong prime.

It is an emirp because it is prime and its reverse (112078121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121870211 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121870811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60935105 + 60935106.

It is an arithmetic number, because the mean of its divisors is an integer number (60935106).

Almost surely, 2^121870211 is an apocalyptic number.

121870211 is a deficient number, since it is larger than the sum of its proper divisors (1).

121870211 is an equidigital number, since it uses as much as digits as its factorization.

121870211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 23.

The square root of 121870211 is about 11039.4841817904. The cubic root of 121870211 is about 495.7916265620.

The spelling of 121870211 in words is "one hundred twenty-one million, eight hundred seventy thousand, two hundred eleven".