212117315 has 4 divisors (see below), whose sum is σ = 254540784. Its totient is φ = 169693848.

The previous prime is 212117309. The next prime is 212117329. The reversal of 212117315 is 513711212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212117315 - 2¹² = 212113219 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21211727 + ... + 21211736.

It is an arithmetic number, because the mean of its divisors is an integer number (63635196).

Almost surely, 2^212117315 is an apocalyptic number.

212117315 is a deficient number, since it is larger than the sum of its proper divisors (42423469).

212117315 is an equidigital number, since it uses as much as digits as its factorization.

212117315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42423468.

The product of its digits is 420, while the sum is 23.

The square root of 212117315 is about 14564.2478350240. The cubic root of 212117315 is about 596.3831625838.

Adding to 212117315 its reverse (513711212), we get a palindrome (725828527).

The spelling of 212117315 in words is "two hundred twelve million, one hundred seventeen thousand, three hundred fifteen".