21025032265 has 16 divisors (see below), whose sum is σ = 26209443456. Its totient is φ = 16178646400.

The previous prime is 21025032187. The next prime is 21025032269. The reversal of 21025032265 is 56223052012.

It is not a de Polignac number, because 21025032265 - 2²⁵ = 20991477833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21025032269) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 707707 + ... + 736816.

It is an arithmetic number, because the mean of its divisors is an integer number (1638090216).

Almost surely, 2^21025032265 is an apocalyptic number.

It is an amenable number.

21025032265 is a deficient number, since it is larger than the sum of its proper divisors (5184411191).

21025032265 is a wasteful number, since it uses less digits than its factorization.

21025032265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444640.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 21025032265 its reverse (56223052012), we get a palindrome (77248084277).

The spelling of 21025032265 in words is "twenty-one billion, twenty-five million, thirty-two thousand, two hundred sixty-five".