21130423325 has 24 divisors (see below), whose sum is σ = 29191881600. Its totient is φ = 15040601600.

The previous prime is 21130423313. The next prime is 21130423333. The reversal of 21130423325 is 52332403112.

It is a happy number.

It is not a de Polignac number, because 21130423325 - 2³⁴ = 3950554141 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21130423294 and 21130423303.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 804500 + ... + 830349.

It is an arithmetic number, because the mean of its divisors is an integer number (1216328400).

Almost surely, 2^21130423325 is an apocalyptic number.

21130423325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21130423325 is a deficient number, since it is larger than the sum of its proper divisors (8061458275).

21130423325 is a wasteful number, since it uses less digits than its factorization.

21130423325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634917 (or 1634912 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21130423325 its reverse (52332403112), we get a palindrome (73462826437).

The spelling of 21130423325 in words is "twenty-one billion, one hundred thirty million, four hundred twenty-three thousand, three hundred twenty-five".