216302281 has 24 divisors (see below), whose sum is σ = 247496256. Its totient is φ = 187867680.

The previous prime is 216302263. The next prime is 216302287. The reversal of 216302281 is 182203612.

It is not a de Polignac number, because 216302281 - 2⁵ = 216302249 is a prime.

It is a super-2 number, since 2×216302281² = 93573353531605922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216302287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 488046 + ... + 488488.

It is an arithmetic number, because the mean of its divisors is an integer number (10312344).

Almost surely, 2^216302281 is an apocalyptic number.

It is an amenable number.

216302281 is a deficient number, since it is larger than the sum of its proper divisors (31193975).

216302281 is a wasteful number, since it uses less digits than its factorization.

216302281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 216302281 is about 14707.2186697553. The cubic root of 216302281 is about 600.2797593524.

Adding to 216302281 its reverse (182203612), we get a palindrome (398505893).

The spelling of 216302281 in words is "two hundred sixteen million, three hundred two thousand, two hundred eighty-one".