21232424225 has 6 divisors (see below), whose sum is σ = 26328206070. Its totient is φ = 16985939360.

The previous prime is 21232424221. The next prime is 21232424243. The reversal of 21232424225 is 52242423212.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3516015616 + 17716408609 = 59296^2 + 133103^2 .

It is not a de Polignac number, because 21232424225 - 2² = 21232424221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21232424221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 424648460 + ... + 424648509.

It is an arithmetic number, because the mean of its divisors is an integer number (4388034345).

Almost surely, 2^21232424225 is an apocalyptic number.

21232424225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21232424225 is a deficient number, since it is larger than the sum of its proper divisors (5095781845).

21232424225 is an equidigital number, since it uses as much as digits as its factorization.

21232424225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849296979 (or 849296974 counting only the distinct ones).

The product of its digits is 15360, while the sum is 29.

Adding to 21232424225 its reverse (52242423212), we get a palindrome (73474847437).

The spelling of 21232424225 in words is "twenty-one billion, two hundred thirty-two million, four hundred twenty-four thousand, two hundred twenty-five".