2121230505 has 32 divisors (see below), whose sum is σ = 3597364224. Its totient is φ = 1063663616.

The previous prime is 2121230497. The next prime is 2121230557. The reversal of 2121230505 is 5050321212.

It is not a de Polignac number, because 2121230505 - 2³ = 2121230497 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 275944 + ... + 283526.

It is an arithmetic number, because the mean of its divisors is an integer number (112417632).

Almost surely, 2^2121230505 is an apocalyptic number.

It is an amenable number.

2121230505 is a deficient number, since it is larger than the sum of its proper divisors (1476133719).

2121230505 is a wasteful number, since it uses less digits than its factorization.

2121230505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8705.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 2121230505 is about 46056.8182248839. The cubic root of 2121230505 is about 1284.8801545585.

Adding to 2121230505 its reverse (5050321212), we get a palindrome (7171551717).

The spelling of 2121230505 in words is "two billion, one hundred twenty-one million, two hundred thirty thousand, five hundred five".