212100617 has 6 divisors (see below), whose sum is σ = 214518558. Its totient is φ = 209709632.

The previous prime is 212100611. The next prime is 212100671. The reversal of 212100617 is 716001212.

It can be written as a sum of positive squares in 3 ways, for example, as 3904576 + 208196041 = 1976^2 + 14429^2 .

It is not a de Polignac number, because 212100617 - 2¹⁰ = 212099593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212100611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5468 + ... + 21309.

It is an arithmetic number, because the mean of its divisors is an integer number (35753093).

Almost surely, 2^212100617 is an apocalyptic number.

It is an amenable number.

212100617 is a deficient number, since it is larger than the sum of its proper divisors (2417941).

212100617 is an frugal number, since it uses more digits than its factorization.

212100617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26955 (or 26866 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 212100617 is about 14563.6745706570. The cubic root of 212100617 is about 596.3675129618.

Adding to 212100617 its reverse (716001212), we get a palindrome (928101829).

The spelling of 212100617 in words is "two hundred twelve million, one hundred thousand, six hundred seventeen".