21325357 has 8 divisors (see below), whose sum is σ = 22369536. Its totient is φ = 20305872.

The previous prime is 21325349. The next prime is 21325387. The reversal of 21325357 is 75352312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21325357 - 2³ = 21325349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21325307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4393 + ... + 7870.

It is an arithmetic number, because the mean of its divisors is an integer number (2796192).

Almost surely, 2^21325357 is an apocalyptic number.

It is an amenable number.

21325357 is a deficient number, since it is larger than the sum of its proper divisors (1044179).

21325357 is a wasteful number, since it uses less digits than its factorization.

21325357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12347.

The product of its digits is 6300, while the sum is 28.

The square root of 21325357 is about 4617.9386093797. The cubic root of 21325357 is about 277.3099399274.

Adding to 21325357 its reverse (75352312), we get a palindrome (96677669).

The spelling of 21325357 in words is "twenty-one million, three hundred twenty-five thousand, three hundred fifty-seven".