215643477271 has 2 divisors, whose sum is σ = 215643477272. Its totient is φ = 215643477270.

The previous prime is 215643477227. The next prime is 215643477299. The reversal of 215643477271 is 172774346512.

215643477271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215643477271 - 2¹⁷ = 215643346199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215643477571) 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 as a sum of consecutive naturals, namely, 107821738635 + 107821738636.

It is an arithmetic number, because the mean of its divisors is an integer number (107821738636).

Almost surely, 2^215643477271 is an apocalyptic number.

215643477271 is a deficient number, since it is larger than the sum of its proper divisors (1).

215643477271 is an equidigital number, since it uses as much as digits as its factorization.

215643477271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1975680, while the sum is 49.

The spelling of 215643477271 in words is "two hundred fifteen billion, six hundred forty-three million, four hundred seventy-seven thousand, two hundred seventy-one".