118212021 has 16 divisors (see below), whose sum is σ = 180779520. Its totient is φ = 76265280.

The previous prime is 118212013. The next prime is 118212023. The reversal of 118212021 is 120212811.

It is not a de Polignac number, because 118212021 - 2³ = 118212013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 118211985 and 118212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118212023) 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, 69780 + ... + 71453.

It is an arithmetic number, because the mean of its divisors is an integer number (11298720).

Almost surely, 2^118212021 is an apocalyptic number.

It is an amenable number.

118212021 is a deficient number, since it is larger than the sum of its proper divisors (62567499).

118212021 is a wasteful number, since it uses less digits than its factorization.

118212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141273 (or 141267 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 118212021 is about 10872.5351689475. The cubic root of 118212021 is about 490.7804043443.

Adding to 118212021 its reverse (120212811), we get a palindrome (238424832).

It can be divided in two parts, 1182 and 12021, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 118212021 in words is "one hundred eighteen million, two hundred twelve thousand, twenty-one".