212685686 has 4 divisors (see below), whose sum is σ = 319028532. Its totient is φ = 106342842.

The previous prime is 212685673. The next prime is 212685701. The reversal of 212685686 is 686586212.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 53171420 + ... + 53171423.

It is an arithmetic number, because the mean of its divisors is an integer number (79757133).

Almost surely, 2^212685686 is an apocalyptic number.

212685686 is a deficient number, since it is larger than the sum of its proper divisors (106342846).

212685686 is a wasteful number, since it uses less digits than its factorization.

212685686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106342845.

The product of its digits is 276480, while the sum is 44.

The square root of 212685686 is about 14583.7473236477. The cubic root of 212685686 is about 596.9153595727.

The spelling of 212685686 in words is "two hundred twelve million, six hundred eighty-five thousand, six hundred eighty-six".