2181008093 has 4 divisors (see below), whose sum is σ = 2379281568. Its totient is φ = 1982734620.

The previous prime is 2181008083. The next prime is 2181008099. The reversal of 2181008093 is 3908001812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2181008093 - 2⁴ = 2181008077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181008099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99136721 + ... + 99136742.

It is an arithmetic number, because the mean of its divisors is an integer number (594820392).

Almost surely, 2^2181008093 is an apocalyptic number.

It is an amenable number.

2181008093 is a deficient number, since it is larger than the sum of its proper divisors (198273475).

2181008093 is a wasteful number, since it uses less digits than its factorization.

2181008093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198273474.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 2181008093 is about 46701.2643618992. The cubic root of 2181008093 is about 1296.8380934447.

The spelling of 2181008093 in words is "two billion, one hundred eighty-one million, eight thousand, ninety-three".