2121309555 has 32 divisors (see below), whose sum is σ = 3643009344. Its totient is φ = 1050218496.

The previous prime is 2121309539. The next prime is 2121309643. The reversal of 2121309555 is 5559031212.

It is not a de Polignac number, because 2121309555 - 2⁴ = 2121309539 is a prime.

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, 38364 + ... + 75593.

It is an arithmetic number, because the mean of its divisors is an integer number (113844042).

Almost surely, 2^2121309555 is an apocalyptic number.

2121309555 is a deficient number, since it is larger than the sum of its proper divisors (1521699789).

2121309555 is a wasteful number, since it uses less digits than its factorization.

2121309555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114055.

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 2121309555 is about 46057.6763960146. The cubic root of 2121309555 is about 1284.8961151868.

The spelling of 2121309555 in words is "two billion, one hundred twenty-one million, three hundred nine thousand, five hundred fifty-five".