118201821 has 16 divisors (see below), whose sum is σ = 159744000. Its totient is φ = 77737968.

The previous prime is 118201817. The next prime is 118201823. The reversal of 118201821 is 128102811.

It is not a de Polignac number, because 118201821 - 2² = 118201817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 118201791 and 118201800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118201823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75040 + ... + 76598.

It is an arithmetic number, because the mean of its divisors is an integer number (9984000).

Almost surely, 2^118201821 is an apocalyptic number.

It is an amenable number.

118201821 is a deficient number, since it is larger than the sum of its proper divisors (41542179).

118201821 is a wasteful number, since it uses less digits than its factorization.

118201821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888.

The product of its (nonzero) digits is 256, while the sum is 24.

The square root of 118201821 is about 10872.0660869956. The cubic root of 118201821 is about 490.7662881711.

The spelling of 118201821 in words is "one hundred eighteen million, two hundred one thousand, eight hundred twenty-one".