21435020325 has 72 divisors (see below), whose sum is σ = 38910456000. Its totient is φ = 11278375680.

The previous prime is 21435020323. The next prime is 21435020329. The reversal of 21435020325 is 52302053412.

It is a happy number.

21435020325 is a `hidden beast` number, since 2 + 1 + 435 + 0 + 203 + 25 = 666.

It is not a de Polignac number, because 21435020325 - 2¹ = 21435020323 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21435020323) 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 71 ways as a sum of consecutive naturals, for example, 11994082 + ... + 11995868.

It is an arithmetic number, because the mean of its divisors is an integer number (540423000).

Almost surely, 2^21435020325 is an apocalyptic number.

21435020325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21435020325 is a deficient number, since it is larger than the sum of its proper divisors (17475435675).

21435020325 is a wasteful number, since it uses less digits than its factorization.

21435020325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2491 (or 2483 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 21435020325 its reverse (52302053412), we get a palindrome (73737073737).

The spelling of 21435020325 in words is "twenty-one billion, four hundred thirty-five million, twenty thousand, three hundred twenty-five".