2181998107 has 2 divisors, whose sum is σ = 2181998108. Its totient is φ = 2181998106.

The previous prime is 2181998101. The next prime is 2181998111. The reversal of 2181998107 is 7018991812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2181998107 - 2³ = 2181998099 is a prime.

It is a super-2 number, since 2×2181998107² = 9522231477903166898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2181998101) 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, 1090999053 + 1090999054.

It is an arithmetic number, because the mean of its divisors is an integer number (1090999054).

Almost surely, 2^2181998107 is an apocalyptic number.

2181998107 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181998107 is an equidigital number, since it uses as much as digits as its factorization.

2181998107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 46.

The square root of 2181998107 is about 46711.8625939921. The cubic root of 2181998107 is about 1297.0342861531.

The spelling of 2181998107 in words is "two billion, one hundred eighty-one million, nine hundred ninety-eight thousand, one hundred seven".