215015131247 has 12 divisors (see below), whose sum is σ = 252414324360. Its totient is φ = 182607865776.

The previous prime is 215015131223. The next prime is 215015131277. The reversal of 215015131247 is 742131510512.

It is not a de Polignac number, because 215015131247 - 2¹⁶ = 215015065711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215015131277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20123393 + ... + 20134074.

It is an arithmetic number, because the mean of its divisors is an integer number (21034527030).

Almost surely, 2^215015131247 is an apocalyptic number.

215015131247 is a deficient number, since it is larger than the sum of its proper divisors (37399193113).

215015131247 is a wasteful number, since it uses less digits than its factorization.

215015131247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40257590 (or 40257583 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 32.

Adding to 215015131247 its reverse (742131510512), we get a palindrome (957146641759).

The spelling of 215015131247 in words is "two hundred fifteen billion, fifteen million, one hundred thirty-one thousand, two hundred forty-seven".