21024125425 has 12 divisors (see below), whose sum is σ = 26077207936. Its totient is φ = 16814595600.

The previous prime is 21024125413. The next prime is 21024125443. The reversal of 21024125425 is 52452142012.

It is a happy number.

It is not a de Polignac number, because 21024125425 - 2⁵ = 21024125393 is a prime.

It is a super-2 number, since 2×21024125425² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21024125393 and 21024125402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25029 + ... + 206578.

Almost surely, 2^21024125425 is an apocalyptic number.

21024125425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21024125425 is a deficient number, since it is larger than the sum of its proper divisors (5053082511).

21024125425 is a wasteful number, since it uses less digits than its factorization.

21024125425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235248 (or 235243 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 21024125425 its reverse (52452142012), we get a palindrome (73476267437).

The spelling of 21024125425 in words is "twenty-one billion, twenty-four million, one hundred twenty-five thousand, four hundred twenty-five".