218220247 has 8 divisors (see below), whose sum is σ = 250248096. Its totient is φ = 186405792.

The previous prime is 218220203. The next prime is 218220259. The reversal of 218220247 is 742022812.

218220247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 218220247 - 2²³ = 209831639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218220047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51148 + ... + 55249.

It is an arithmetic number, because the mean of its divisors is an integer number (31281012).

Almost surely, 2^218220247 is an apocalyptic number.

218220247 is a deficient number, since it is larger than the sum of its proper divisors (32027849).

218220247 is a wasteful number, since it uses less digits than its factorization.

218220247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106697.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 218220247 is about 14772.2796818907. The cubic root of 218220247 is about 602.0487804609.

The spelling of 218220247 in words is "two hundred eighteen million, two hundred twenty thousand, two hundred forty-seven".