21843671 has 2 divisors, whose sum is σ = 21843672. Its totient is φ = 21843670.

The previous prime is 21843667. The next prime is 21843677. The reversal of 21843671 is 17634812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21843671 - 2² = 21843667 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21843677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10921835 + 10921836.

It is an arithmetic number, because the mean of its divisors is an integer number (10921836).

Almost surely, 2^21843671 is an apocalyptic number.

21843671 is a deficient number, since it is larger than the sum of its proper divisors (1).

21843671 is an equidigital number, since it uses as much as digits as its factorization.

21843671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 32.

The square root of 21843671 is about 4673.7213224582. The cubic root of 21843671 is about 279.5386578037.

The spelling of 21843671 in words is "twenty-one million, eight hundred forty-three thousand, six hundred seventy-one".