21283859 has 2 divisors, whose sum is σ = 21283860. Its totient is φ = 21283858.

The previous prime is 21283841. The next prime is 21283891. The reversal of 21283859 is 95838212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21283859 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21283259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10641929 + 10641930.

It is an arithmetic number, because the mean of its divisors is an integer number (10641930).

Almost surely, 2^21283859 is an apocalyptic number.

21283859 is a deficient number, since it is larger than the sum of its proper divisors (1).

21283859 is an equidigital number, since it uses as much as digits as its factorization.

21283859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 38.

The square root of 21283859 is about 4613.4432910788. The cubic root of 21283859 is about 277.1299463718.

The spelling of 21283859 in words is "twenty-one million, two hundred eighty-three thousand, eight hundred fifty-nine".