2181815280871 has 2 divisors, whose sum is σ = 2181815280872. Its totient is φ = 2181815280870.

The previous prime is 2181815280811. The next prime is 2181815280917. The reversal of 2181815280871 is 1780825181812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2181815280871 - 2¹⁷ = 2181815149799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181815280811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090907640435 + 1090907640436.

It is an arithmetic number, because the mean of its divisors is an integer number (1090907640436).

Almost surely, 2^{2181815280871} is an apocalyptic number.

2181815280871 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181815280871 is an equidigital number, since it uses as much as digits as its factorization.

2181815280871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 573440, while the sum is 52.

The spelling of 2181815280871 in words is "two trillion, one hundred eighty-one billion, eight hundred fifteen million, two hundred eighty thousand, eight hundred seventy-one".