118006821 has 16 divisors (see below), whose sum is σ = 175035520. Its totient is φ = 78576480.

The previous prime is 118006817. The next prime is 118006871. The reversal of 118006821 is 128600811.

It is not a de Polignac number, because 118006821 - 2² = 118006817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118006871) 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, 25776 + ... + 30006.

It is an arithmetic number, because the mean of its divisors is an integer number (10939720).

Almost surely, 2^118006821 is an apocalyptic number.

It is an amenable number.

118006821 is a deficient number, since it is larger than the sum of its proper divisors (57028699).

118006821 is a wasteful number, since it uses less digits than its factorization.

118006821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5273 (or 5267 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 118006821 is about 10863.0944486366. The cubic root of 118006821 is about 490.4962638476.

The spelling of 118006821 in words is "one hundred eighteen million, six thousand, eight hundred twenty-one".