21328327 has 2 divisors, whose sum is σ = 21328328. Its totient is φ = 21328326.

The previous prime is 21328309. The next prime is 21328339. The reversal of 21328327 is 72382312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21328327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21328295 and 21328304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21328367) 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 as a sum of consecutive naturals, namely, 10664163 + 10664164.

It is an arithmetic number, because the mean of its divisors is an integer number (10664164).

Almost surely, 2^21328327 is an apocalyptic number.

21328327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21328327 is an equidigital number, since it uses as much as digits as its factorization.

21328327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 28.

The square root of 21328327 is about 4618.2601702373. The cubic root of 21328327 is about 277.3228130576.

The spelling of 21328327 in words is "twenty-one million, three hundred twenty-eight thousand, three hundred twenty-seven".