212217677 has 6 divisors (see below), whose sum is σ = 246865518. Its totient is φ = 181900824.

The previous prime is 212217673. The next prime is 212217683. The reversal of 212217677 is 776712212.

It can be written as a sum of positive squares in only one way, i.e., 190743721 + 21473956 = 13811^2 + 4634^2 .

It is not a de Polignac number, because 212217677 - 2² = 212217673 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 (212217673) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2165438 + ... + 2165535.

It is an arithmetic number, because the mean of its divisors is an integer number (41144253).

Almost surely, 2^212217677 is an apocalyptic number.

It is an amenable number.

212217677 is a deficient number, since it is larger than the sum of its proper divisors (34647841).

212217677 is an equidigital number, since it uses as much as digits as its factorization.

212217677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4330987 (or 4330980 counting only the distinct ones).

The product of its digits is 16464, while the sum is 35.

The square root of 212217677 is about 14567.6929196081. The cubic root of 212217677 is about 596.4772060923.

Adding to 212217677 its reverse (776712212), we get a palindrome (988929889).

The spelling of 212217677 in words is "two hundred twelve million, two hundred seventeen thousand, six hundred seventy-seven".