2121045666 has 16 divisors (see below), whose sum is σ = 4305406944. Its totient is φ = 696462624.

The previous prime is 2121045629. The next prime is 2121045691. The reversal of 2121045666 is 6665401212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2637715 + ... + 2638518.

It is an arithmetic number, because the mean of its divisors is an integer number (269087934).

Almost surely, 2^2121045666 is an apocalyptic number.

2121045666 is an abundant number, since it is smaller than the sum of its proper divisors (2184361278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121045666 is a wasteful number, since it uses less digits than its factorization.

2121045666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5276305.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 2121045666 is about 46054.8115401637. The cubic root of 2121045666 is about 1284.8428330037.

Adding to 2121045666 its reverse (6665401212), we get a palindrome (8786446878).

The spelling of 2121045666 in words is "two billion, one hundred twenty-one million, forty-five thousand, six hundred sixty-six".