21843461 has 2 divisors, whose sum is σ = 21843462. Its totient is φ = 21843460.

The previous prime is 21843449. The next prime is 21843539. The reversal of 21843461 is 16434812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21252100 + 591361 = 4610^2 + 769^2 .

It is a cyclic number.

It is not a de Polignac number, because 21843461 - 2⁶ = 21843397 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 (21843361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10921730 + 10921731.

It is an arithmetic number, because the mean of its divisors is an integer number (10921731).

Almost surely, 2^21843461 is an apocalyptic number.

It is an amenable number.

21843461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21843461 is an equidigital number, since it uses as much as digits as its factorization.

21843461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 29.

The square root of 21843461 is about 4673.6988563663. The cubic root of 21843461 is about 279.5377619942.

The spelling of 21843461 in words is "twenty-one million, eight hundred forty-three thousand, four hundred sixty-one".