213212617 has 4 divisors (see below), whose sum is σ = 214104960. Its totient is φ = 212320276.

The previous prime is 213212609. The next prime is 213212621. The reversal of 213212617 is 716212312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213212617 - 2³ = 213212609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213212591 and 213212600.

It is not an unprimeable number, because it can be changed into a prime (213212627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445813 + ... + 446290.

It is an arithmetic number, because the mean of its divisors is an integer number (53526240).

Almost surely, 2^213212617 is an apocalyptic number.

It is an amenable number.

213212617 is a deficient number, since it is larger than the sum of its proper divisors (892343).

213212617 is an equidigital number, since it uses as much as digits as its factorization.

213212617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892342.

The product of its digits is 1008, while the sum is 25.

The square root of 213212617 is about 14601.8018408688. The cubic root of 213212617 is about 597.4079077034.

Adding to 213212617 its reverse (716212312), we get a palindrome (929424929).

The spelling of 213212617 in words is "two hundred thirteen million, two hundred twelve thousand, six hundred seventeen".