215312131155 has 32 divisors (see below), whose sum is σ = 376398586368. Its totient is φ = 104232358400.

The previous prime is 215312131147. The next prime is 215312131171. The reversal of 215312131155 is 551131213512.

It is not a de Polignac number, because 215312131155 - 2³ = 215312131147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 901686 + ... + 1115195.

It is an arithmetic number, because the mean of its divisors is an integer number (11762455824).

Almost surely, 2^215312131155 is an apocalyptic number.

215312131155 is a deficient number, since it is larger than the sum of its proper divisors (161086455213).

215312131155 is a wasteful number, since it uses less digits than its factorization.

215312131155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017547.

The product of its digits is 4500, while the sum is 30.

Adding to 215312131155 its reverse (551131213512), we get a palindrome (766443344667).

The spelling of 215312131155 in words is "two hundred fifteen billion, three hundred twelve million, one hundred thirty-one thousand, one hundred fifty-five".