12821025 has 24 divisors (see below), whose sum is σ = 24226624. Its totient is φ = 5860800.

The previous prime is 12821021. The next prime is 12821027. The reversal of 12821025 is 52012821.

It is a happy number.

It is not a de Polignac number, because 12821025 - 2² = 12821021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 = 12820992 and 12821010.

It is not an unprimeable number, because it can be changed into a prime (12821021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11686 + ... + 12735.

Almost surely, 2^12821025 is an apocalyptic number.

12821025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12821025 is a deficient number, since it is larger than the sum of its proper divisors (11405599).

12821025 is a wasteful number, since it uses less digits than its factorization.

12821025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24441 (or 24436 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 12821025 is about 3580.6458914559. The cubic root of 12821025 is about 234.0494270635.

Adding to 12821025 its reverse (52012821), we get a palindrome (64833846).

The spelling of 12821025 in words is "twelve million, eight hundred twenty-one thousand, twenty-five".