216126317 has 4 divisors (see below), whose sum is σ = 235774176. Its totient is φ = 196478460.

The previous prime is 216126259. The next prime is 216126341. The reversal of 216126317 is 713621612.

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 216126317 - 2⁸ = 216126061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216126317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216126347) 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, 9823913 + ... + 9823934.

It is an arithmetic number, because the mean of its divisors is an integer number (58943544).

Almost surely, 2^216126317 is an apocalyptic number.

It is an amenable number.

216126317 is a deficient number, since it is larger than the sum of its proper divisors (19647859).

216126317 is a wasteful number, since it uses less digits than its factorization.

216126317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19647858.

The product of its digits is 3024, while the sum is 29.

The square root of 216126317 is about 14701.2352202119. The cubic root of 216126317 is about 600.1169373931.

Adding to 216126317 its reverse (713621612), we get a palindrome (929747929).

The spelling of 216126317 in words is "two hundred sixteen million, one hundred twenty-six thousand, three hundred seventeen".