21525105435 has 16 divisors (see below), whose sum is σ = 35627761440. Its totient is φ = 11084192000.

The previous prime is 21525105419. The next prime is 21525105439. The reversal of 21525105435 is 53450152512.

It is not a de Polignac number, because 21525105435 - 2⁴ = 21525105419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21525105396 and 21525105405.

It is not an unprimeable number, because it can be changed into a prime (21525105439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24741066 + ... + 24741935.

It is an arithmetic number, because the mean of its divisors is an integer number (2226735090).

Almost surely, 2^21525105435 is an apocalyptic number.

21525105435 is a deficient number, since it is larger than the sum of its proper divisors (14102656005).

21525105435 is a wasteful number, since it uses less digits than its factorization.

21525105435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49483038.

The product of its (nonzero) digits is 30000, while the sum is 33.

Adding to 21525105435 its reverse (53450152512), we get a palindrome (74975257947).

The spelling of 21525105435 in words is "twenty-one billion, five hundred twenty-five million, one hundred five thousand, four hundred thirty-five".