21063425 has 24 divisors (see below), whose sum is σ = 28625400. Its totient is φ = 15303680.

The previous prime is 21063403. The next prime is 21063451. The reversal of 21063425 is 52436012.

It can be written as a sum of positive squares in 12 ways, for example, as 5626384 + 15437041 = 2372^2 + 3929^2 .

It is not a de Polignac number, because 21063425 - 2⁸ = 21063169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21063425.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11471 + ... + 13179.

It is an arithmetic number, because the mean of its divisors is an integer number (1192725).

Almost surely, 2^21063425 is an apocalyptic number.

21063425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21063425 is a deficient number, since it is larger than the sum of its proper divisors (7561975).

21063425 is a wasteful number, since it uses less digits than its factorization.

21063425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765 (or 1760 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 21063425 is about 4589.4907124865. The cubic root of 21063425 is about 276.1698920757.

Adding to 21063425 its reverse (52436012), we get a palindrome (73499437).

The spelling of 21063425 in words is "twenty-one million, sixty-three thousand, four hundred twenty-five".