218214407 has 2 divisors, whose sum is σ = 218214408. Its totient is φ = 218214406.

The previous prime is 218214371. The next prime is 218214433. The reversal of 218214407 is 704412812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218214407 - 2¹⁸ = 217952263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218214407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218214307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109107203 + 109107204.

It is an arithmetic number, because the mean of its divisors is an integer number (109107204).

Almost surely, 2^218214407 is an apocalyptic number.

218214407 is a deficient number, since it is larger than the sum of its proper divisors (1).

218214407 is an equidigital number, since it uses as much as digits as its factorization.

218214407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 218214407 is about 14772.0820130407. The cubic root of 218214407 is about 602.0434097459.

The spelling of 218214407 in words is "two hundred eighteen million, two hundred fourteen thousand, four hundred seven".