2120105 has 16 divisors (see below), whose sum is σ = 2770320. Its totient is φ = 1557504.

The previous prime is 2120101. The next prime is 2120113. The reversal of 2120105 is 5010212.

It can be written as a sum of positive squares in 8 ways, for example, as 1819801 + 300304 = 1349^2 + 548^2 .

It is not a de Polignac number, because 2120105 - 2² = 2120101 is a prime.

It is a super-2 number, since 2×2120105² = 8989690422050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120101) 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, 10889 + ... + 11081.

It is an arithmetic number, because the mean of its divisors is an integer number (173145).

2^2120105 is an apocalyptic number.

It is an amenable number.

2120105 is a deficient number, since it is larger than the sum of its proper divisors (650215).

2120105 is an equidigital number, since it uses as much as digits as its factorization.

2120105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 2120105 is about 1456.0580345577. The cubic root of 2120105 is about 128.4652865904.

Adding to 2120105 its reverse (5010212), we get a palindrome (7130317).

The spelling of 2120105 in words is "two million, one hundred twenty thousand, one hundred five".