215317727247 has 48 divisors (see below), whose sum is σ = 339648423936. Its totient is φ = 118732521600.

The previous prime is 215317727173. The next prime is 215317727279. The reversal of 215317727247 is 742727713512.

215317727247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215317727247 - 2⁸ = 215317726991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215317727196 and 215317727205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215317727347) 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 47 ways as a sum of consecutive naturals, for example, 284435193 + ... + 284435949.

It is an arithmetic number, because the mean of its divisors is an integer number (7076008832).

Almost surely, 2^215317727247 is an apocalyptic number.

215317727247 is a deficient number, since it is larger than the sum of its proper divisors (124330696689).

215317727247 is an frugal number, since it uses more digits than its factorization.

215317727247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120 (or 1459 counting only the distinct ones).

The product of its digits is 1152480, while the sum is 48.

The spelling of 215317727247 in words is "two hundred fifteen billion, three hundred seventeen million, seven hundred twenty-seven thousand, two hundred forty-seven".