216201005 has 4 divisors (see below), whose sum is σ = 259441212. Its totient is φ = 172960800.

The previous prime is 216201001. The next prime is 216201023. The reversal of 216201005 is 500102612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 100380361 + 115820644 = 10019^2 + 10762^2 .

It is not a de Polignac number, because 216201005 - 2² = 216201001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216201001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21620096 + ... + 21620105.

It is an arithmetic number, because the mean of its divisors is an integer number (64860303).

Almost surely, 2^216201005 is an apocalyptic number.

It is an amenable number.

216201005 is a deficient number, since it is larger than the sum of its proper divisors (43240207).

216201005 is an equidigital number, since it uses as much as digits as its factorization.

216201005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43240206.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 216201005 is about 14703.7751955068. The cubic root of 216201005 is about 600.1860580388.

Adding to 216201005 its reverse (500102612), we get a palindrome (716303617).

It can be divided in two parts, 21 and 6201005, that added together give a palindrome (6201026).

The spelling of 216201005 in words is "two hundred sixteen million, two hundred one thousand, five".