1021317265 has 16 divisors (see below), whose sum is σ = 1240557120. Its totient is φ = 807127360.

The previous prime is 1021317239. The next prime is 1021317281. The reversal of 1021317265 is 5627131201.

It is a happy number.

It is not a de Polignac number, because 1021317265 - 2⁵ = 1021317233 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145251 + ... + 152119.

It is an arithmetic number, because the mean of its divisors is an integer number (77534820).

Almost surely, 2^1021317265 is an apocalyptic number.

It is an amenable number.

1021317265 is a deficient number, since it is larger than the sum of its proper divisors (219239855).

1021317265 is a wasteful number, since it uses less digits than its factorization.

1021317265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7232.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1021317265 is about 31958.0547749703. The cubic root of 1021317265 is about 1007.0558528486.

Adding to 1021317265 its reverse (5627131201), we get a palindrome (6648448466).

The spelling of 1021317265 in words is "one billion, twenty-one million, three hundred seventeen thousand, two hundred sixty-five".