21525327 has 12 divisors (see below), whose sum is σ = 31815784. Its totient is φ = 14016240.

The previous prime is 21525319. The next prime is 21525331. The reversal of 21525327 is 72352512.

It is not a de Polignac number, because 21525327 - 2³ = 21525319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21525327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525227) 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 11 ways as a sum of consecutive naturals, for example, 27424 + ... + 28197.

Almost surely, 2^21525327 is an apocalyptic number.

21525327 is a deficient number, since it is larger than the sum of its proper divisors (10290457).

21525327 is a wasteful number, since it uses less digits than its factorization.

21525327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55670 (or 55667 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 21525327 is about 4639.5395245649. The cubic root of 21525327 is about 278.1740322929.

Adding to 21525327 its reverse (72352512), we get a palindrome (93877839).

The spelling of 21525327 in words is "twenty-one million, five hundred twenty-five thousand, three hundred twenty-seven".