218421011 has 8 divisors (see below), whose sum is σ = 228285120. Its totient is φ = 208712448.

The previous prime is 218421001. The next prime is 218421023. The reversal of 218421011 is 110124812.

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 218421011 - 2¹⁸ = 218158867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218421001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36011 + ... + 41636.

It is an arithmetic number, because the mean of its divisors is an integer number (28535640).

Almost surely, 2^218421011 is an apocalyptic number.

218421011 is a deficient number, since it is larger than the sum of its proper divisors (9864109).

218421011 is an equidigital number, since it uses as much as digits as its factorization.

218421011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77773.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 218421011 is about 14779.0734147984. The cubic root of 218421011 is about 602.2333534248.

Adding to 218421011 its reverse (110124812), we get a palindrome (328545823).

The spelling of 218421011 in words is "two hundred eighteen million, four hundred twenty-one thousand, eleven".