118920921 has 16 divisors (see below), whose sum is σ = 181515264. Its totient is φ = 67841424.

The previous prime is 118920889. The next prime is 118920937. The reversal of 118920921 is 129029811.

It is not a de Polignac number, because 118920921 - 2⁵ = 118920889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (118920941) 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, 9100 + ... + 17906.

It is an arithmetic number, because the mean of its divisors is an integer number (11344704).

Almost surely, 2^118920921 is an apocalyptic number.

It is an amenable number.

118920921 is a deficient number, since it is larger than the sum of its proper divisors (62594343).

118920921 is an equidigital number, since it uses as much as digits as its factorization.

118920921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9460.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 118920921 is about 10905.0869322532. The cubic root of 118920921 is about 491.7594956135.

The spelling of 118920921 in words is "one hundred eighteen million, nine hundred twenty thousand, nine hundred twenty-one".