21834859 has 2 divisors, whose sum is σ = 21834860. Its totient is φ = 21834858.

The previous prime is 21834833. The next prime is 21834863. The reversal of 21834859 is 95843812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21834859 - 2¹³ = 21826667 is a prime.

It is a super-2 number, since 2×21834859² = 953522135099762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21834899) 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, 10917429 + 10917430.

It is an arithmetic number, because the mean of its divisors is an integer number (10917430).

Almost surely, 2^21834859 is an apocalyptic number.

21834859 is a deficient number, since it is larger than the sum of its proper divisors (1).

21834859 is an equidigital number, since it uses as much as digits as its factorization.

21834859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 21834859 is about 4672.7785096236. The cubic root of 21834859 is about 279.5010629939.

The spelling of 21834859 in words is "twenty-one million, eight hundred thirty-four thousand, eight hundred fifty-nine".