21303425 has 48 divisors (see below), whose sum is σ = 31872960. Its totient is φ = 13920000.

The previous prime is 21303421. The next prime is 21303467. The reversal of 21303425 is 52430312.

It is a happy number.

It is not a de Polignac number, because 21303425 - 2² = 21303421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21303397 and 21303406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 210875 + ... + 210975.

It is an arithmetic number, because the mean of its divisors is an integer number (664020).

Almost surely, 2^21303425 is an apocalyptic number.

21303425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21303425 is a deficient number, since it is larger than the sum of its proper divisors (10569535).

21303425 is a wasteful number, since it uses less digits than its factorization.

21303425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21303425 is about 4615.5633458983. The cubic root of 21303425 is about 277.2148411242.

Adding to 21303425 its reverse (52430312), we get a palindrome (73733737).

It can be divided in two parts, 2130 and 3425, that added together give a palindrome (5555).

The spelling of 21303425 in words is "twenty-one million, three hundred three thousand, four hundred twenty-five".