821225265 has 32 divisors (see below), whose sum is σ = 1512656640. Its totient is φ = 372670464.

The previous prime is 821225261. The next prime is 821225287. The reversal of 821225265 is 562522128.

It is a happy number.

It is not a de Polignac number, because 821225265 - 2² = 821225261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (821225261) 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, 14160 + ... + 42929.

It is an arithmetic number, because the mean of its divisors is an integer number (47270520).

Almost surely, 2^821225265 is an apocalyptic number.

It is an amenable number.

821225265 is a deficient number, since it is larger than the sum of its proper divisors (691431375).

821225265 is a wasteful number, since it uses less digits than its factorization.

821225265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57241.

The product of its digits is 19200, while the sum is 33.

The square root of 821225265 is about 28657.0281955404. The cubic root of 821225265 is about 936.4561237976.

The spelling of 821225265 in words is "eight hundred twenty-one million, two hundred twenty-five thousand, two hundred sixty-five".