212109671 has 4 divisors (see below), whose sum is σ = 212139144. Its totient is φ = 212080200.

The previous prime is 212109619. The next prime is 212109721. The reversal of 212109671 is 176901212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 212109671 - 2⁶ = 212109607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212109371) by changing a digit.

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, 4001 + ... + 20981.

It is an arithmetic number, because the mean of its divisors is an integer number (53034786).

Almost surely, 2^212109671 is an apocalyptic number.

212109671 is a deficient number, since it is larger than the sum of its proper divisors (29473).

212109671 is a wasteful number, since it uses less digits than its factorization.

212109671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29472.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 212109671 is about 14563.9854092209. The cubic root of 212109671 is about 596.3759986116.

The spelling of 212109671 in words is "two hundred twelve million, one hundred nine thousand, six hundred seventy-one".