2118605021 has 8 divisors (see below), whose sum is σ = 2301767160. Its totient is φ = 1938327552.

The previous prime is 2118605017. The next prime is 2118605023. The reversal of 2118605021 is 1205068112.

It can be written as a sum of positive squares in 4 ways, for example, as 105288121 + 2013316900 = 10261^2 + 44870^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2118605021 - 2² = 2118605017 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 (2118605023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 719636 + ... + 722573.

It is an arithmetic number, because the mean of its divisors is an integer number (287720895).

Almost surely, 2^2118605021 is an apocalyptic number.

It is an amenable number.

2118605021 is a deficient number, since it is larger than the sum of its proper divisors (183162139).

2118605021 is a wasteful number, since it uses less digits than its factorization.

2118605021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1442335.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 2118605021 is about 46028.3067361814. The cubic root of 2118605021 is about 1284.3498295069.

The spelling of 2118605021 in words is "two billion, one hundred eighteen million, six hundred five thousand, twenty-one".