21325424515525 has 96 divisors (see below), whose sum is σ = 30377900134400. Its totient is φ = 14719646073600.

The previous prime is 21325424515511. The next prime is 21325424515541. The reversal of 21325424515525 is 52551542452312.

It is not a de Polignac number, because 21325424515525 - 2³¹ = 21323277031877 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, 705867670 + ... + 705897880.

Almost surely, 2^{21325424515525} is an apocalyptic number.

21325424515525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21325424515525 is a deficient number, since it is larger than the sum of its proper divisors (9052475618875).

21325424515525 is a wasteful number, since it uses less digits than its factorization.

21325424515525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31779 (or 31774 counting only the distinct ones).

The product of its digits is 2400000, while the sum is 46.

Adding to 21325424515525 its reverse (52551542452312), we get a palindrome (73876966967837).

The spelling of 21325424515525 in words is "twenty-one trillion, three hundred twenty-five billion, four hundred twenty-four million, five hundred fifteen thousand, five hundred twenty-five".