12118440021 has 16 divisors (see below), whose sum is σ = 17110997568. Its totient is φ = 7602566400.

The previous prime is 12118440017. The next prime is 12118440023. The reversal of 12118440021 is 12004481121.

It is not a de Polignac number, because 12118440021 - 2² = 12118440017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12118439973 and 12118440000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12118440023) 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, 423786 + ... + 451476.

It is an arithmetic number, because the mean of its divisors is an integer number (1069437348).

Almost surely, 2^12118440021 is an apocalyptic number.

It is an amenable number.

12118440021 is a deficient number, since it is larger than the sum of its proper divisors (4992557547).

12118440021 is a wasteful number, since it uses less digits than its factorization.

12118440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36292.

The product of its (nonzero) digits is 512, while the sum is 24.

The spelling of 12118440021 in words is "twelve billion, one hundred eighteen million, four hundred forty thousand, twenty-one".