218216126 has 16 divisors (see below), whose sum is σ = 343256400. Its totient is φ = 103900608.

The previous prime is 218216123. The next prime is 218216149. The reversal of 218216126 is 621612812.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218216123) 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, 21536 + ... + 30003.

It is an arithmetic number, because the mean of its divisors is an integer number (21453525).

Almost surely, 2^218216126 is an apocalyptic number.

218216126 is a deficient number, since it is larger than the sum of its proper divisors (125040274).

218216126 is a wasteful number, since it uses less digits than its factorization.

218216126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51643.

The product of its digits is 2304, while the sum is 29.

The square root of 218216126 is about 14772.1401970060. The cubic root of 218216126 is about 602.0449906221.

Adding to 218216126 its reverse (621612812), we get a palindrome (839828938).

The spelling of 218216126 in words is "two hundred eighteen million, two hundred sixteen thousand, one hundred twenty-six".