21230025 has 24 divisors (see below), whose sum is σ = 37167264. Its totient is φ = 10656000.

The previous prime is 21230023. The next prime is 21230047. The reversal of 21230025 is 52003212.

It is not a de Polignac number, because 21230025 - 2¹ = 21230023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 21229986 and 21230013.

It is not an unprimeable number, because it can be changed into a prime (21230023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7051 + ... + 9600.

It is an arithmetic number, because the mean of its divisors is an integer number (1548636).

Almost surely, 2^21230025 is an apocalyptic number.

21230025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21230025 is a deficient number, since it is larger than the sum of its proper divisors (15937239).

21230025 is a wasteful number, since it uses less digits than its factorization.

21230025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16681 (or 16676 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 21230025 is about 4607.6051263102. The cubic root of 21230025 is about 276.8960976506.

Adding to 21230025 its reverse (52003212), we get a palindrome (73233237).

The spelling of 21230025 in words is "twenty-one million, two hundred thirty thousand, twenty-five".