21280327 has 2 divisors, whose sum is σ = 21280328. Its totient is φ = 21280326.

The previous prime is 21280307. The next prime is 21280349. The reversal of 21280327 is 72308212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21280327 - 2¹⁹ = 20756039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21280307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10640163 + 10640164.

It is an arithmetic number, because the mean of its divisors is an integer number (10640164).

Almost surely, 2^21280327 is an apocalyptic number.

21280327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21280327 is an equidigital number, since it uses as much as digits as its factorization.

21280327 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21280327 is about 4613.0604808522. The cubic root of 21280327 is about 277.1146158637.

Adding to 21280327 its reverse (72308212), we get a palindrome (93588539).

The spelling of 21280327 in words is "twenty-one million, two hundred eighty thousand, three hundred twenty-seven".