218214705 has 32 divisors (see below), whose sum is σ = 362568960. Its totient is φ = 111937280.

The previous prime is 218214653. The next prime is 218214707. The reversal of 218214705 is 507412812.

It is not a de Polignac number, because 218214705 - 2²⁷ = 83996977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218214707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134479 + ... + 136091.

It is an arithmetic number, because the mean of its divisors is an integer number (11330280).

Almost surely, 2^218214705 is an apocalyptic number.

It is an amenable number.

218214705 is a deficient number, since it is larger than the sum of its proper divisors (144354255).

218214705 is a wasteful number, since it uses less digits than its factorization.

218214705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961.

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 218214705 is about 14772.0920996317. The cubic root of 218214705 is about 602.0436838018.

The spelling of 218214705 in words is "two hundred eighteen million, two hundred fourteen thousand, seven hundred five".