21002525265 has 48 divisors (see below), whose sum is σ = 35213781888. Its totient is φ = 10686816000.

The previous prime is 21002525227. The next prime is 21002525363. The reversal of 21002525265 is 56252520012.

It is not a de Polignac number, because 21002525265 - 2¹⁰ = 21002524241 is a prime.

It is a super-2 number, since 2×21002525265² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1013205 + ... + 1033725.

It is an arithmetic number, because the mean of its divisors is an integer number (733620456).

Almost surely, 2^21002525265 is an apocalyptic number.

It is an amenable number.

21002525265 is a deficient number, since it is larger than the sum of its proper divisors (14211256623).

21002525265 is a wasteful number, since it uses less digits than its factorization.

21002525265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20662 (or 20631 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 21002525265 in words is "twenty-one billion, two million, five hundred twenty-five thousand, two hundred sixty-five".