2146321565 has 16 divisors (see below), whose sum is σ = 2638720128. Its totient is φ = 1675066176.

The previous prime is 2146321531. The next prime is 2146321577. The reversal of 2146321565 is 5651236412.

It is a cyclic number.

It is not a de Polignac number, because 2146321565 - 2¹² = 2146317469 is a prime.

It is a Duffinian number.

It is a congruent 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, 182864 + ... + 194246.

It is an arithmetic number, because the mean of its divisors is an integer number (164920008).

Almost surely, 2^2146321565 is an apocalyptic number.

It is an amenable number.

2146321565 is a deficient number, since it is larger than the sum of its proper divisors (492398563).

2146321565 is a wasteful number, since it uses less digits than its factorization.

2146321565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12308.

The product of its digits is 43200, while the sum is 35.

The square root of 2146321565 is about 46328.4099122774. The cubic root of 2146321565 is about 1289.9263954558.

Adding to 2146321565 its reverse (5651236412), we get a palindrome (7797557977).

The spelling of 2146321565 in words is "two billion, one hundred forty-six million, three hundred twenty-one thousand, five hundred sixty-five".