216772123 has 2 divisors, whose sum is σ = 216772124. Its totient is φ = 216772122.

The previous prime is 216772103. The next prime is 216772133. The reversal of 216772123 is 321277612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216772123 - 2⁵ = 216772091 is a prime.

It is not a weakly prime, because it can be changed into another prime (216772103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108386061 + 108386062.

It is an arithmetic number, because the mean of its divisors is an integer number (108386062).

Almost surely, 2^216772123 is an apocalyptic number.

216772123 is a deficient number, since it is larger than the sum of its proper divisors (1).

216772123 is an equidigital number, since it uses as much as digits as its factorization.

216772123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 31.

The square root of 216772123 is about 14723.1831816357. The cubic root of 216772123 is about 600.7140785197.

The spelling of 216772123 in words is "two hundred sixteen million, seven hundred seventy-two thousand, one hundred twenty-three".