21363123425 has 24 divisors (see below), whose sum is σ = 30404589696. Its totient is φ = 14586099840.

The previous prime is 21363123377. The next prime is 21363123433. The reversal of 21363123425 is 52432136312.

It is not a de Polignac number, because 21363123425 - 2¹⁰ = 21363122401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21363123391 and 21363123400.

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, 221189 + ... + 302738.

It is an arithmetic number, because the mean of its divisors is an integer number (1266857904).

Almost surely, 2^21363123425 is an apocalyptic number.

21363123425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21363123425 is a deficient number, since it is larger than the sum of its proper divisors (9041466271).

21363123425 is a wasteful number, since it uses less digits than its factorization.

21363123425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524177 (or 524172 counting only the distinct ones).

The product of its digits is 25920, while the sum is 32.

Adding to 21363123425 its reverse (52432136312), we get a palindrome (73795259737).

The spelling of 21363123425 in words is "twenty-one billion, three hundred sixty-three million, one hundred twenty-three thousand, four hundred twenty-five".