118213121 has 16 divisors (see below), whose sum is σ = 135644544. Its totient is φ = 102054144.

The previous prime is 118213057. The next prime is 118213133. The reversal of 118213121 is 121312811.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 118213121 - 2⁶ = 118213057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 118213093 and 118213102.

It is not an unprimeable number, because it can be changed into a prime (118213021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35306 + ... + 38508.

It is an arithmetic number, because the mean of its divisors is an integer number (8477784).

Almost surely, 2^118213121 is an apocalyptic number.

It is an amenable number.

118213121 is a deficient number, since it is larger than the sum of its proper divisors (17431423).

118213121 is a wasteful number, since it uses less digits than its factorization.

118213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3400.

The product of its digits is 96, while the sum is 20.

The square root of 118213121 is about 10872.5857550079. The cubic root of 118213121 is about 490.7819266282.

Adding to 118213121 its reverse (121312811), we get a palindrome (239525932).

The spelling of 118213121 in words is "one hundred eighteen million, two hundred thirteen thousand, one hundred twenty-one".