216305252 has 6 divisors (see below), whose sum is σ = 378534198. Its totient is φ = 108152624.

The previous prime is 216305251. The next prime is 216305261. The reversal of 216305252 is 252503612.

It can be written as a sum of positive squares in only one way, i.e., 148011556 + 68293696 = 12166^2 + 8264^2 .

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (216305251) 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 as a sum of consecutive naturals, namely, 27038153 + ... + 27038160.

It is an arithmetic number, because the mean of its divisors is an integer number (63089033).

Almost surely, 2^216305252 is an apocalyptic number.

It is an amenable number.

216305252 is a deficient number, since it is larger than the sum of its proper divisors (162228946).

216305252 is a wasteful number, since it uses less digits than its factorization.

216305252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54076317 (or 54076315 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 216305252 is about 14707.3196742302. The cubic root of 216305252 is about 600.2825077022.

Adding to 216305252 its reverse (252503612), we get a palindrome (468808864).

The spelling of 216305252 in words is "two hundred sixteen million, three hundred five thousand, two hundred fifty-two".