212640671 has 8 divisors (see below), whose sum is σ = 214725840. Its totient is φ = 210563712.

The previous prime is 212640601. The next prime is 212640677. The reversal of 212640671 is 176046212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212640671 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 (212640677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58421 + ... + 61953.

It is an arithmetic number, because the mean of its divisors is an integer number (26840730).

Almost surely, 2^212640671 is an apocalyptic number.

212640671 is a deficient number, since it is larger than the sum of its proper divisors (2085169).

212640671 is a wasteful number, since it uses less digits than its factorization.

212640671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 212640671 is about 14582.2039143608. The cubic root of 212640671 is about 596.8732441530.

Adding to 212640671 its reverse (176046212), we get a palindrome (388686883).

The spelling of 212640671 in words is "two hundred twelve million, six hundred forty thousand, six hundred seventy-one".