216321097 has 2 divisors, whose sum is σ = 216321098. Its totient is φ = 216321096.

The previous prime is 216321071. The next prime is 216321101. The reversal of 216321097 is 790123612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215825481 + 495616 = 14691^2 + 704^2 .

It is a cyclic number.

It is not a de Polignac number, because 216321097 - 2⁷ = 216320969 is a prime.

It is not a weakly prime, because it can be changed into another prime (216321047) 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, 108160548 + 108160549.

It is an arithmetic number, because the mean of its divisors is an integer number (108160549).

Almost surely, 2^216321097 is an apocalyptic number.

It is an amenable number.

216321097 is a deficient number, since it is larger than the sum of its proper divisors (1).

216321097 is an equidigital number, since it uses as much as digits as its factorization.

216321097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 216321097 is about 14707.8583417165. The cubic root of 216321097 is about 600.2971648345.

The spelling of 216321097 in words is "two hundred sixteen million, three hundred twenty-one thousand, ninety-seven".