21501325445325 has 96 divisors (see below), whose sum is σ = 41935438817280. Its totient is φ = 9602897587200.

The previous prime is 21501325445297. The next prime is 21501325445351. The reversal of 21501325445325 is 52354452310512.

It is not a de Polignac number, because 21501325445325 - 2⁶ = 21501325445261 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15650095 + ... + 16968444.

It is an arithmetic number, because the mean of its divisors is an integer number (436827487680).

Almost surely, 2^{21501325445325} is an apocalyptic number.

21501325445325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21501325445325 is a deficient number, since it is larger than the sum of its proper divisors (20434113371955).

21501325445325 is a wasteful number, since it uses less digits than its factorization.

21501325445325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32618627 (or 32618622 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 42.

Adding to 21501325445325 its reverse (52354452310512), we get a palindrome (73855777755837).

The spelling of 21501325445325 in words is "twenty-one trillion, five hundred one billion, three hundred twenty-five million, four hundred forty-five thousand, three hundred twenty-five".