216720701 has 2 divisors, whose sum is σ = 216720702. Its totient is φ = 216720700.

The previous prime is 216720677. The next prime is 216720703. The reversal of 216720701 is 107027612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187279225 + 29441476 = 13685^2 + 5426^2 .

It is a cyclic number.

It is not a de Polignac number, because 216720701 - 2¹⁰ = 216719677 is a prime.

Together with 216720703, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216720703) 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, 108360350 + 108360351.

It is an arithmetic number, because the mean of its divisors is an integer number (108360351).

Almost surely, 2^216720701 is an apocalyptic number.

It is an amenable number.

216720701 is a deficient number, since it is larger than the sum of its proper divisors (1).

216720701 is an equidigital number, since it uses as much as digits as its factorization.

216720701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 216720701 is about 14721.4367844990. The cubic root of 216720701 is about 600.6665749296. Note that the first 3 decimals are identical.

The spelling of 216720701 in words is "two hundred sixteen million, seven hundred twenty thousand, seven hundred one".