2129205 has 32 divisors (see below), whose sum is σ = 3749760. Its totient is φ = 1025280.

The previous prime is 2129203. The next prime is 2129207. The reversal of 2129205 is 5029212.

2129205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2129203) and next prime (2129207).

It is not a de Polignac number, because 2129205 - 2¹ = 2129203 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11806 + ... + 11984.

It is an arithmetic number, because the mean of its divisors is an integer number (117180).

2^2129205 is an apocalyptic number.

It is an amenable number.

2129205 is a deficient number, since it is larger than the sum of its proper divisors (1620555).

2129205 is a wasteful number, since it uses less digits than its factorization.

2129205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 2129205 is about 1459.1795640016. The cubic root of 2129205 is about 128.6488255335.

The spelling of 2129205 in words is "two million, one hundred twenty-nine thousand, two hundred five".