218215107 has 64 divisors (see below), whose sum is σ = 368824320. Its totient is φ = 126316800.

The previous prime is 218215103. The next prime is 218215121. The reversal of 218215107 is 701512812.

It is not a de Polignac number, because 218215107 - 2² = 218215103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (218215103) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1261273 + ... + 1261445.

It is an arithmetic number, because the mean of its divisors is an integer number (5762880).

Almost surely, 2^218215107 is an apocalyptic number.

218215107 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

218215107 is a deficient number, since it is larger than the sum of its proper divisors (150609213).

218215107 is a wasteful number, since it uses less digits than its factorization.

218215107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 218215107 is about 14772.1057063643. The cubic root of 218215107 is about 602.0440535011.

Adding to 218215107 its reverse (701512812), we get a palindrome (919727919).

It can be divided in two parts, 21 and 8215107, that added together give a palindrome (8215128).

The spelling of 218215107 in words is "two hundred eighteen million, two hundred fifteen thousand, one hundred seven".