2118121 has 2 divisors, whose sum is σ = 2118122. Its totient is φ = 2118120.

The previous prime is 2118119. The next prime is 2118163. The reversal of 2118121 is 1218112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2073600 + 44521 = 1440^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 2118121 - 2¹ = 2118119 is a prime.

Together with 2118119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2118095 and 2118104.

It is not a weakly prime, because it can be changed into another prime (2115121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1059060 + 1059061.

It is an arithmetic number, because the mean of its divisors is an integer number (1059061).

2^2118121 is an apocalyptic number.

It is an amenable number.

2118121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2118121 is an equidigital number, since it uses as much as digits as its factorization.

2118121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32, while the sum is 16.

The square root of 2118121 is about 1455.3765835687. The cubic root of 2118121 is about 128.4252013628.

Subtracting from 2118121 its reverse (1218112), we obtain a palindrome (900009).

The spelling of 2118121 in words is "two million, one hundred eighteen thousand, one hundred twenty-one".