2181374888447 has 2 divisors, whose sum is σ = 2181374888448. Its totient is φ = 2181374888446.

The previous prime is 2181374888393. The next prime is 2181374888491. The reversal of 2181374888447 is 7448884731812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2181374888447 - 2¹⁶ = 2181374822911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181374888347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090687444223 + 1090687444224.

It is an arithmetic number, because the mean of its divisors is an integer number (1090687444224).

Almost surely, 2^{2181374888447} is an apocalyptic number.

2181374888447 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181374888447 is an equidigital number, since it uses as much as digits as its factorization.

2181374888447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77070336, while the sum is 65.

The spelling of 2181374888447 in words is "two trillion, one hundred eighty-one billion, three hundred seventy-four million, eight hundred eighty-eight thousand, four hundred forty-seven".