21625357 has 8 divisors (see below), whose sum is σ = 23330720. Its totient is φ = 19926000.

The previous prime is 21625339. The next prime is 21625367. The reversal of 21625357 is 75352612.

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 21625357 - 2⁷ = 21625229 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 (21625367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8482 + ... + 10732.

It is an arithmetic number, because the mean of its divisors is an integer number (2916340).

Almost surely, 2^21625357 is an apocalyptic number.

It is an amenable number.

21625357 is a deficient number, since it is larger than the sum of its proper divisors (1705363).

21625357 is a wasteful number, since it uses less digits than its factorization.

21625357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003.

The product of its digits is 12600, while the sum is 31.

The square root of 21625357 is about 4650.3071941540. The cubic root of 21625357 is about 278.6042658889.

Adding to 21625357 its reverse (75352612), we get a palindrome (96977969).

The spelling of 21625357 in words is "twenty-one million, six hundred twenty-five thousand, three hundred fifty-seven".