21024325225 has 6 divisors (see below), whose sum is σ = 26070163310. Its totient is φ = 16819460160.

The previous prime is 21024325123. The next prime is 21024325297. The reversal of 21024325225 is 52252342012.

It can be written as a sum of positive squares in 3 ways, for example, as 3480528016 + 17543797209 = 58996^2 + 132453^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21024325225 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21024325193 and 21024325202.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 420486480 + ... + 420486529.

Almost surely, 2^21024325225 is an apocalyptic number.

21024325225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21024325225 is a deficient number, since it is larger than the sum of its proper divisors (5045838085).

21024325225 is an equidigital number, since it uses as much as digits as its factorization.

21024325225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840973019 (or 840973014 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 21024325225 its reverse (52252342012), we get a palindrome (73276667237).

The spelling of 21024325225 in words is "twenty-one billion, twenty-four million, three hundred twenty-five thousand, two hundred twenty-five".