21202005525 has 12 divisors (see below), whose sum is σ = 35053982592. Its totient is φ = 11307736240.

The previous prime is 21202005523. The next prime is 21202005529. The reversal of 21202005525 is 52550020212.

It is not a de Polignac number, because 21202005525 - 2¹ = 21202005523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202005495 and 21202005504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202005523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141346629 + ... + 141346778.

It is an arithmetic number, because the mean of its divisors is an integer number (2921165216).

Almost surely, 2^21202005525 is an apocalyptic number.

21202005525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21202005525 is a deficient number, since it is larger than the sum of its proper divisors (13851977067).

21202005525 is a wasteful number, since it uses less digits than its factorization.

21202005525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282693420 (or 282693415 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

Adding to 21202005525 its reverse (52550020212), we get a palindrome (73752025737).

The spelling of 21202005525 in words is "twenty-one billion, two hundred two million, five thousand, five hundred twenty-five".