21328425265 has 24 divisors (see below), whose sum is σ = 29782256040. Its totient is φ = 14620531968.

The previous prime is 21328425263. The next prime is 21328425271. The reversal of 21328425265 is 56252482312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 451584 + 21327973681 = 672^2 + 146041^2 .

It is not a de Polignac number, because 21328425265 - 2¹ = 21328425263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21328425263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 868171 + ... + 892399.

It is an arithmetic number, because the mean of its divisors is an integer number (1240927335).

Almost surely, 2^21328425265 is an apocalyptic number.

It is an amenable number.

21328425265 is a deficient number, since it is larger than the sum of its proper divisors (8453830775).

21328425265 is a wasteful number, since it uses less digits than its factorization.

21328425265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27841 (or 27834 counting only the distinct ones).

The product of its digits is 230400, while the sum is 40.

The spelling of 21328425265 in words is "twenty-one billion, three hundred twenty-eight million, four hundred twenty-five thousand, two hundred sixty-five".