216100321 has 2 divisors, whose sum is σ = 216100322. Its totient is φ = 216100320.

The previous prime is 216100289. The next prime is 216100333. The reversal of 216100321 is 123001612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179024400 + 37075921 = 13380^2 + 6089^2 .

It is a cyclic number.

It is not a de Polignac number, because 216100321 - 2⁵ = 216100289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216100295 and 216100304.

It is not a weakly prime, because it can be changed into another prime (216400321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108050160 + 108050161.

It is an arithmetic number, because the mean of its divisors is an integer number (108050161).

Almost surely, 2^216100321 is an apocalyptic number.

It is an amenable number.

216100321 is a deficient number, since it is larger than the sum of its proper divisors (1).

216100321 is an equidigital number, since it uses as much as digits as its factorization.

216100321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 216100321 is about 14700.3510502301. The cubic root of 216100321 is about 600.0928754377.

Adding to 216100321 its reverse (123001612), we get a palindrome (339101933).

The spelling of 216100321 in words is "two hundred sixteen million, one hundred thousand, three hundred twenty-one".