2118138225 has 24 divisors (see below), whose sum is σ = 4002273600. Its totient is φ = 968291520.

The previous prime is 2118138181. The next prime is 2118138229. The reversal of 2118138225 is 5228318112.

It is not a de Polignac number, because 2118138225 - 2⁸ = 2118137969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2118138229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2016750 + ... + 2017799.

It is an arithmetic number, because the mean of its divisors is an integer number (166761400).

Almost surely, 2^2118138225 is an apocalyptic number.

2118138225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2118138225 is a deficient number, since it is larger than the sum of its proper divisors (1884135375).

2118138225 is a wasteful number, since it uses less digits than its factorization.

2118138225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4034569 (or 4034564 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 2118138225 is about 46023.2357076292. The cubic root of 2118138225 is about 1284.2554948867.

The spelling of 2118138225 in words is "two billion, one hundred eighteen million, one hundred thirty-eight thousand, two hundred twenty-five".