2121757165 has 32 divisors (see below), whose sum is σ = 2948814720. Its totient is φ = 1448448000.

The previous prime is 2121757163. The next prime is 2121757171. The reversal of 2121757165 is 5617571212.

It is not a de Polignac number, because 2121757165 - 2¹ = 2121757163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121757163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 372106 + ... + 377764.

It is an arithmetic number, because the mean of its divisors is an integer number (92150460).

Almost surely, 2^2121757165 is an apocalyptic number.

It is an amenable number.

2121757165 is a deficient number, since it is larger than the sum of its proper divisors (827057555).

2121757165 is a wasteful number, since it uses less digits than its factorization.

2121757165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6093.

The product of its digits is 29400, while the sum is 37.

The square root of 2121757165 is about 46062.5353731207. The cubic root of 2121757165 is about 1284.9864826206.

The spelling of 2121757165 in words is "two billion, one hundred twenty-one million, seven hundred fifty-seven thousand, one hundred sixty-five".