216211351 has 4 divisors (see below), whose sum is σ = 218440432. Its totient is φ = 213982272.

The previous prime is 216211343. The next prime is 216211357. The reversal of 216211351 is 153112612.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 216211351 - 2³ = 216211343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216211357) 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, 1114395 + ... + 1114588.

It is an arithmetic number, because the mean of its divisors is an integer number (54610108).

Almost surely, 2^216211351 is an apocalyptic number.

216211351 is a deficient number, since it is larger than the sum of its proper divisors (2229081).

216211351 is an equidigital number, since it uses as much as digits as its factorization.

216211351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2229080.

The product of its digits is 360, while the sum is 22.

The square root of 216211351 is about 14704.1270057083. The cubic root of 216211351 is about 600.1956315772.

Adding to 216211351 its reverse (153112612), we get a palindrome (369323963).

The spelling of 216211351 in words is "two hundred sixteen million, two hundred eleven thousand, three hundred fifty-one".