21230424525 has 24 divisors (see below), whose sum is σ = 35126055360. Its totient is φ = 11314800640.

The previous prime is 21230424521. The next prime is 21230424539. The reversal of 21230424525 is 52542403212.

It is not a de Polignac number, because 21230424525 - 2² = 21230424521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21230424492 and 21230424501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230424521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5224 + ... + 206126.

It is an arithmetic number, because the mean of its divisors is an integer number (1463585640).

Almost surely, 2^21230424525 is an apocalyptic number.

21230424525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21230424525 is a deficient number, since it is larger than the sum of its proper divisors (13895630835).

21230424525 is a wasteful number, since it uses less digits than its factorization.

21230424525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202325 (or 202320 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21230424525 its reverse (52542403212), we get a palindrome (73772827737).

The spelling of 21230424525 in words is "twenty-one billion, two hundred thirty million, four hundred twenty-four thousand, five hundred twenty-five".