2121066505 has 8 divisors (see below), whose sum is σ = 2571520392. Its totient is φ = 1679359488.

The previous prime is 2121066487. The next prime is 2121066517. The reversal of 2121066505 is 5056601212.

It can be written as a sum of positive squares in 4 ways, for example, as 6538249 + 2114528256 = 2557^2 + 45984^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121066505 - 2¹⁵ = 2121033737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2186182 + ... + 2187151.

It is an arithmetic number, because the mean of its divisors is an integer number (321440049).

Almost surely, 2^2121066505 is an apocalyptic number.

It is an amenable number.

2121066505 is a deficient number, since it is larger than the sum of its proper divisors (450453887).

2121066505 is an equidigital number, since it uses as much as digits as its factorization.

2121066505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4373435.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 2121066505 is about 46055.0377808986. The cubic root of 2121066505 is about 1284.8470407950.

Adding to 2121066505 its reverse (5056601212), we get a palindrome (7177667717).

The spelling of 2121066505 in words is "two billion, one hundred twenty-one million, sixty-six thousand, five hundred five".