2122145 has 4 divisors (see below), whose sum is σ = 2546580. Its totient is φ = 1697712.

The previous prime is 2122139. The next prime is 2122151. The reversal of 2122145 is 5412212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2122139) and next prime (2122151).

It can be written as a sum of positive squares in 2 ways, for example, as 698896 + 1423249 = 836^2 + 1193^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122145 - 2¹⁰ = 2121121 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212210 + ... + 212219.

It is an arithmetic number, because the mean of its divisors is an integer number (636645).

2^2122145 is an apocalyptic number.

It is an amenable number.

2122145 is a deficient number, since it is larger than the sum of its proper divisors (424435).

2122145 is an equidigital number, since it uses as much as digits as its factorization.

2122145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424434.

The product of its digits is 160, while the sum is 17.

The square root of 2122145 is about 1456.7583876539. The cubic root of 2122145 is about 128.5064771877.

Adding to 2122145 its reverse (5412212), we get a palindrome (7534357).

The spelling of 2122145 in words is "two million, one hundred twenty-two thousand, one hundred forty-five".