2121125555 has 16 divisors (see below), whose sum is σ = 2633637888. Its totient is φ = 1638300000.

The previous prime is 2121125549. The next prime is 2121125609. The reversal of 2121125555 is 5555211212.

It is not a de Polignac number, because 2121125555 - 2¹⁰ = 2121124531 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50930 + ... + 82680.

It is an arithmetic number, because the mean of its divisors is an integer number (164602368).

Almost surely, 2^2121125555 is an apocalyptic number.

2121125555 is a deficient number, since it is larger than the sum of its proper divisors (512512333).

2121125555 is a wasteful number, since it uses less digits than its factorization.

2121125555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32218.

The product of its digits is 5000, while the sum is 29.

The square root of 2121125555 is about 46055.6788572267. The cubic root of 2121125555 is about 1284.8589639656.

Adding to 2121125555 its reverse (5555211212), we get a palindrome (7676336767).

The spelling of 2121125555 in words is "two billion, one hundred twenty-one million, one hundred twenty-five thousand, five hundred fifty-five".