2181393443 has 2 divisors, whose sum is σ = 2181393444. Its totient is φ = 2181393442.

The previous prime is 2181393433. The next prime is 2181393449. The reversal of 2181393443 is 3443931812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2181393443 - 2¹⁰ = 2181392419 is a prime.

It is a super-3 number, since 3×2181393443³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2181393397 and 2181393406.

It is not a weakly prime, because it can be changed into another prime (2181393449) 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 as a sum of consecutive naturals, namely, 1090696721 + 1090696722.

It is an arithmetic number, because the mean of its divisors is an integer number (1090696722).

Almost surely, 2^2181393443 is an apocalyptic number.

2181393443 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181393443 is an equidigital number, since it uses as much as digits as its factorization.

2181393443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 38.

The square root of 2181393443 is about 46705.3898709774. The cubic root of 2181393443 is about 1296.9144659460.

The spelling of 2181393443 in words is "two billion, one hundred eighty-one million, three hundred ninety-three thousand, four hundred forty-three".