1021000265 has 16 divisors (see below), whose sum is σ = 1244265600. Its totient is φ = 804131712.

The previous prime is 1021000261. The next prime is 1021000319. The reversal of 1021000265 is 5620001201.

It is a cyclic number.

It is not a de Polignac number, because 1021000265 - 2² = 1021000261 is a prime.

It is a super-2 number, since 2×1021000265² = 2084883082260140450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1021000261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223676 + ... + 228194.

It is an arithmetic number, because the mean of its divisors is an integer number (77766600).

Almost surely, 2^1021000265 is an apocalyptic number.

It is an amenable number.

1021000265 is a deficient number, since it is larger than the sum of its proper divisors (223265335).

1021000265 is an equidigital number, since it uses as much as digits as its factorization.

1021000265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5216.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1021000265 is about 31953.0947640444. The cubic root of 1021000265 is about 1006.9516509025.

Adding to 1021000265 its reverse (5620001201), we get a palindrome (6641001466).

The spelling of 1021000265 in words is "one billion, twenty-one million, two hundred sixty-five", and thus it is an aban number.