21028363 has 2 divisors, whose sum is σ = 21028364. Its totient is φ = 21028362.

The previous prime is 21028361. The next prime is 21028379. The reversal of 21028363 is 36382012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21028363 - 2¹ = 21028361 is a prime.

Together with 21028361, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21028361) 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 as a sum of consecutive naturals, namely, 10514181 + 10514182.

It is an arithmetic number, because the mean of its divisors is an integer number (10514182).

Almost surely, 2^21028363 is an apocalyptic number.

21028363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21028363 is an equidigital number, since it uses as much as digits as its factorization.

21028363 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 21028363 is about 4585.6693077456. The cubic root of 21028363 is about 276.0165702787.

The spelling of 21028363 in words is "twenty-one million, twenty-eight thousand, three hundred sixty-three".