216216353 has 8 divisors (see below), whose sum is σ = 238889088. Its totient is φ = 194649664.

The previous prime is 216216337. The next prime is 216216367. The reversal of 216216353 is 353612612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216216353 - 2⁴ = 216216337 is a prime.

It is a super-2 number, since 2×216216353² = 93499022609241218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216216323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276101 + ... + 276882.

It is an arithmetic number, because the mean of its divisors is an integer number (29861136).

Almost surely, 2^216216353 is an apocalyptic number.

216216353 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

216216353 is a deficient number, since it is larger than the sum of its proper divisors (22672735).

216216353 is a wasteful number, since it uses less digits than its factorization.

216216353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553023.

The product of its digits is 6480, while the sum is 29.

The square root of 216216353 is about 14704.2970930269. The cubic root of 216216353 is about 600.2002600043.

Adding to 216216353 its reverse (353612612), we get a palindrome (569828965).

The spelling of 216216353 in words is "two hundred sixteen million, two hundred sixteen thousand, three hundred fifty-three".