2121807875 has 16 divisors (see below), whose sum is σ = 2888746848. Its totient is φ = 1543132000.

The previous prime is 2121807871. The next prime is 2121807887. The reversal of 2121807875 is 5787081212.

It is not a de Polignac number, because 2121807875 - 2² = 2121807871 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (2121807871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 770192 + ... + 772941.

It is an arithmetic number, because the mean of its divisors is an integer number (180546678).

Almost surely, 2^2121807875 is an apocalyptic number.

2121807875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2121807875 is a deficient number, since it is larger than the sum of its proper divisors (766938973).

2121807875 is a wasteful number, since it uses less digits than its factorization.

2121807875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543159 (or 1543149 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 41.

The square root of 2121807875 is about 46063.0858171703. The cubic root of 2121807875 is about 1284.9967195988.

The spelling of 2121807875 in words is "two billion, one hundred twenty-one million, eight hundred seven thousand, eight hundred seventy-five".