21435300525 has 24 divisors (see below), whose sum is σ = 35753336640. Its totient is φ = 11330986240.

The previous prime is 21435300499. The next prime is 21435300529. The reversal of 21435300525 is 52500353412.

It is not a de Polignac number, because 21435300525 - 2⁶ = 21435300461 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21435300492 and 21435300501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21435300529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1256145 + ... + 1273094.

It is an arithmetic number, because the mean of its divisors is an integer number (1489722360).

Almost surely, 2^21435300525 is an apocalyptic number.

21435300525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21435300525 is a deficient number, since it is larger than the sum of its proper divisors (14318036115).

21435300525 is a wasteful number, since it uses less digits than its factorization.

21435300525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2529365 (or 2529360 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 21435300525 its reverse (52500353412), we get a palindrome (73935653937).

The spelling of 21435300525 in words is "twenty-one billion, four hundred thirty-five million, three hundred thousand, five hundred twenty-five".