216742227 has 16 divisors (see below), whose sum is σ = 311717280. Its totient is φ = 133166592.

The previous prime is 216742219. The next prime is 216742237. The reversal of 216742227 is 722247612.

It is a happy number.

It is not a de Polignac number, because 216742227 - 2³ = 216742219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216742217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22299 + ... + 30507.

It is an arithmetic number, because the mean of its divisors is an integer number (19482330).

Almost surely, 2^216742227 is an apocalyptic number.

216742227 is a deficient number, since it is larger than the sum of its proper divisors (94975053).

216742227 is a wasteful number, since it uses less digits than its factorization.

216742227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8902.

The product of its digits is 18816, while the sum is 33.

The square root of 216742227 is about 14722.1678770485. The cubic root of 216742227 is about 600.6864615403.

Adding to 216742227 its reverse (722247612), we get a palindrome (938989839).

The spelling of 216742227 in words is "two hundred sixteen million, seven hundred forty-two thousand, two hundred twenty-seven".