2120564865 has 8 divisors (see below), whose sum is σ = 3392903808. Its totient is φ = 1130967920.

The previous prime is 2120564861. The next prime is 2120564891. The reversal of 2120564865 is 5684650212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2120564865 - 2² = 2120564861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2120564861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70685481 + ... + 70685510.

It is an arithmetic number, because the mean of its divisors is an integer number (424112976).

Almost surely, 2^2120564865 is an apocalyptic number.

It is an amenable number.

2120564865 is a deficient number, since it is larger than the sum of its proper divisors (1272338943).

2120564865 is a wasteful number, since it uses less digits than its factorization.

2120564865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141370999.

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 2120564865 is about 46049.5913662651. The cubic root of 2120564865 is about 1284.7457424645.

The spelling of 2120564865 in words is "two billion, one hundred twenty million, five hundred sixty-four thousand, eight hundred sixty-five".