821315265 has 32 divisors (see below), whose sum is σ = 1349078016. Its totient is φ = 426444480.

The previous prime is 821315221. The next prime is 821315281. The reversal of 821315265 is 562513128.

It is not a de Polignac number, because 821315265 - 2¹³ = 821307073 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 211572 + ... + 215418.

It is an arithmetic number, because the mean of its divisors is an integer number (42158688).

Almost surely, 2^821315265 is an apocalyptic number.

It is an amenable number.

821315265 is a deficient number, since it is larger than the sum of its proper divisors (527762751).

821315265 is a wasteful number, since it uses less digits than its factorization.

821315265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4229.

The product of its digits is 14400, while the sum is 33.

The square root of 821315265 is about 28658.5984479353. The cubic root of 821315265 is about 936.4903320212.

The spelling of 821315265 in words is "eight hundred twenty-one million, three hundred fifteen thousand, two hundred sixty-five".