21325347 has 24 divisors (see below), whose sum is σ = 32617728. Its totient is φ = 13398000.

The previous prime is 21325331. The next prime is 21325349. The reversal of 21325347 is 74352312.

It is not a de Polignac number, because 21325347 - 2⁴ = 21325331 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21325347.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21325349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13972 + ... + 15422.

It is an arithmetic number, because the mean of its divisors is an integer number (1359072).

Almost surely, 2^21325347 is an apocalyptic number.

21325347 is a deficient number, since it is larger than the sum of its proper divisors (11292381).

21325347 is a wasteful number, since it uses less digits than its factorization.

21325347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551 (or 1548 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 21325347 is about 4617.9375266454. The cubic root of 21325347 is about 277.3098965815.

Adding to 21325347 its reverse (74352312), we get a palindrome (95677659).

The spelling of 21325347 in words is "twenty-one million, three hundred twenty-five thousand, three hundred forty-seven".