118218221 has 16 divisors (see below), whose sum is σ = 140963328. Its totient is φ = 97881600.

The previous prime is 118218203. The next prime is 118218251. The reversal of 118218221 is 122812811.

It is a cyclic number.

It is not a de Polignac number, because 118218221 - 2¹⁸ = 117956077 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118218251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4400 + ... + 15993.

It is an arithmetic number, because the mean of its divisors is an integer number (8810208).

Almost surely, 2^118218221 is an apocalyptic number.

118218221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

118218221 is a deficient number, since it is larger than the sum of its proper divisors (22745107).

118218221 is a wasteful number, since it uses less digits than its factorization.

118218221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20452.

The product of its digits is 512, while the sum is 26.

The square root of 118218221 is about 10872.8202873036. The cubic root of 118218221 is about 490.7889843666.

The spelling of 118218221 in words is "one hundred eighteen million, two hundred eighteen thousand, two hundred twenty-one".