21796843 has 2 divisors, whose sum is σ = 21796844. Its totient is φ = 21796842.

The previous prime is 21796807. The next prime is 21796867. The reversal of 21796843 is 34869712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21796843 - 2¹⁷ = 21665771 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21796796 and 21796805.

It is not a weakly prime, because it can be changed into another prime (21796343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10898421 + 10898422.

It is an arithmetic number, because the mean of its divisors is an integer number (10898422).

Almost surely, 2^21796843 is an apocalyptic number.

21796843 is a deficient number, since it is larger than the sum of its proper divisors (1).

21796843 is an equidigital number, since it uses as much as digits as its factorization.

21796843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 21796843 is about 4668.7089221754. The cubic root of 21796843 is about 279.3387585344.

The spelling of 21796843 in words is "twenty-one million, seven hundred ninety-six thousand, eight hundred forty-three".