21430325 has 24 divisors (see below), whose sum is σ = 30623040. Its totient is φ = 14572800.

The previous prime is 21430301. The next prime is 21430327. The reversal of 21430325 is 52303412.

It is a happy number.

It is not a de Polignac number, because 21430325 - 2⁸ = 21430069 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21430297 and 21430306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430327) 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, 23885 + ... + 24765.

It is an arithmetic number, because the mean of its divisors is an integer number (1275960).

Almost surely, 2^21430325 is an apocalyptic number.

21430325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21430325 is a deficient number, since it is larger than the sum of its proper divisors (9192715).

21430325 is a wasteful number, since it uses less digits than its factorization.

21430325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037 (or 1032 counting only the distinct ones).

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

The square root of 21430325 is about 4629.2899023500. The cubic root of 21430325 is about 277.7641885204.

Adding to 21430325 its reverse (52303412), we get a palindrome (73733737).

The spelling of 21430325 in words is "twenty-one million, four hundred thirty thousand, three hundred twenty-five".