21389063 has 2 divisors, whose sum is σ = 21389064. Its totient is φ = 21389062.

The previous prime is 21389059. The next prime is 21389087. The reversal of 21389063 is 36098312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21389063 - 2² = 21389059 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21389363) 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, 10694531 + 10694532.

It is an arithmetic number, because the mean of its divisors is an integer number (10694532).

Almost surely, 2^21389063 is an apocalyptic number.

21389063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21389063 is an equidigital number, since it uses as much as digits as its factorization.

21389063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 21389063 is about 4624.8311320523. The cubic root of 21389063 is about 277.5858047026.

The spelling of 21389063 in words is "twenty-one million, three hundred eighty-nine thousand, sixty-three".