2121005505 has 8 divisors (see below), whose sum is σ = 3393608832. Its totient is φ = 1131202928.

The previous prime is 2121005483. The next prime is 2121005539. The reversal of 2121005505 is 5055001212.

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 2121005505 - 2⁹ = 2121004993 is a prime.

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, 70700169 + ... + 70700198.

It is an arithmetic number, because the mean of its divisors is an integer number (424201104).

Almost surely, 2^2121005505 is an apocalyptic number.

It is an amenable number.

2121005505 is a deficient number, since it is larger than the sum of its proper divisors (1272603327).

2121005505 is a wasteful number, since it uses less digits than its factorization.

2121005505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141400375.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 2121005505 is about 46054.3755250248. The cubic root of 2121005505 is about 1284.8347236547.

Adding to 2121005505 its reverse (5055001212), we get a palindrome (7176006717).

The spelling of 2121005505 in words is "two billion, one hundred twenty-one million, five thousand, five hundred five".