212642686 has 4 divisors (see below), whose sum is σ = 318964032. Its totient is φ = 106321342.

The previous prime is 212642669. The next prime is 212642693. The reversal of 212642686 is 686246212.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53160670 + ... + 53160673.

It is an arithmetic number, because the mean of its divisors is an integer number (79741008).

Almost surely, 2^212642686 is an apocalyptic number.

212642686 is a deficient number, since it is larger than the sum of its proper divisors (106321346).

212642686 is a wasteful number, since it uses less digits than its factorization.

212642686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106321345.

The product of its digits is 55296, while the sum is 37.

The square root of 212642686 is about 14582.2730052622. The cubic root of 212642686 is about 596.8751294866.

Adding to 212642686 its reverse (686246212), we get a palindrome (898888898).

The spelling of 212642686 in words is "two hundred twelve million, six hundred forty-two thousand, six hundred eighty-six".