216742226 has 16 divisors (see below), whose sum is σ = 334393920. Its totient is φ = 105286320.

The previous prime is 216742219. The next prime is 216742237. The reversal of 216742226 is 622247612.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 216742192 and 216742201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60341 + ... + 63831.

It is an arithmetic number, because the mean of its divisors is an integer number (20899620).

Almost surely, 2^216742226 is an apocalyptic number.

216742226 is a deficient number, since it is larger than the sum of its proper divisors (117651694).

216742226 is a wasteful number, since it uses less digits than its factorization.

216742226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4369.

The product of its digits is 16128, while the sum is 32.

The square root of 216742226 is about 14722.1678430862. The cubic root of 216742226 is about 600.6864606165.

Adding to 216742226 its reverse (622247612), we get a palindrome (838989838).

The spelling of 216742226 in words is "two hundred sixteen million, seven hundred forty-two thousand, two hundred twenty-six".