118082821 has 4 divisors (see below), whose sum is σ = 118110700. Its totient is φ = 118054944.

The previous prime is 118082807. The next prime is 118082831. The reversal of 118082821 is 128280811.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 115240225 + 2842596 = 10735^2 + 1686^2 .

It is a cyclic number.

It is not a de Polignac number, because 118082821 - 2⁹ = 118082309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118082831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6126 + ... + 16543.

It is an arithmetic number, because the mean of its divisors is an integer number (29527675).

Almost surely, 2^118082821 is an apocalyptic number.

It is an amenable number.

118082821 is a deficient number, since it is larger than the sum of its proper divisors (27879).

118082821 is an equidigital number, since it uses as much as digits as its factorization.

118082821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27878.

The product of its (nonzero) digits is 2048, while the sum is 31.

The square root of 118082821 is about 10866.5919680459. The cubic root of 118082821 is about 490.6015394464.

The spelling of 118082821 in words is "one hundred eighteen million, eighty-two thousand, eight hundred twenty-one".