121899211 has 6 divisors (see below), whose sum is σ = 141801180. Its totient is φ = 104484996.

The previous prime is 121899187. The next prime is 121899229. The reversal of 121899211 is 112998121.

It is not a de Polignac number, because 121899211 - 2⁷ = 121899083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121899511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1243821 + ... + 1243918.

It is an arithmetic number, because the mean of its divisors is an integer number (23633530).

Almost surely, 2^121899211 is an apocalyptic number.

121899211 is a deficient number, since it is larger than the sum of its proper divisors (19901969).

121899211 is an equidigital number, since it uses as much as digits as its factorization.

121899211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487753 (or 2487746 counting only the distinct ones).

The product of its digits is 2592, while the sum is 34.

The square root of 121899211 is about 11040.7975708279. The cubic root of 121899211 is about 495.8309493157.

The spelling of 121899211 in words is "one hundred twenty-one million, eight hundred ninety-nine thousand, two hundred eleven".