212542115 has 4 divisors (see below), whose sum is σ = 255050544. Its totient is φ = 170033688.

The previous prime is 212542079. The next prime is 212542123. The reversal of 212542115 is 511245212.

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 212542115 - 2²⁶ = 145433251 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, 21254207 + ... + 21254216.

It is an arithmetic number, because the mean of its divisors is an integer number (63762636).

Almost surely, 2^212542115 is an apocalyptic number.

212542115 is a deficient number, since it is larger than the sum of its proper divisors (42508429).

212542115 is an equidigital number, since it uses as much as digits as its factorization.

212542115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42508428.

The product of its digits is 800, while the sum is 23.

The square root of 212542115 is about 14578.8241981307. The cubic root of 212542115 is about 596.7810157475.

Adding to 212542115 its reverse (511245212), we get a palindrome (723787327).

The spelling of 212542115 in words is "two hundred twelve million, five hundred forty-two thousand, one hundred fifteen".