21025327 has 4 divisors (see below), whose sum is σ = 21039040. Its totient is φ = 21011616.

The previous prime is 21025321. The next prime is 21025339. The reversal of 21025327 is 72352012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21025327 - 2¹¹ = 21023279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21025298 and 21025307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025321) 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 3 ways as a sum of consecutive naturals, for example, 4218 + ... + 7735.

It is an arithmetic number, because the mean of its divisors is an integer number (5259760).

Almost surely, 2^21025327 is an apocalyptic number.

21025327 is a deficient number, since it is larger than the sum of its proper divisors (13713).

21025327 is a wasteful number, since it uses less digits than its factorization.

21025327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13712.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21025327 is about 4585.3382645122. The cubic root of 21025327 is about 276.0032862103.

Adding to 21025327 its reverse (72352012), we get a palindrome (93377339).

The spelling of 21025327 in words is "twenty-one million, twenty-five thousand, three hundred twenty-seven".