21341863 has 2 divisors, whose sum is σ = 21341864. Its totient is φ = 21341862.

The previous prime is 21341839. The next prime is 21341867. The reversal of 21341863 is 36814312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21341863 - 2²¹ = 19244711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21341867) 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, 10670931 + 10670932.

It is an arithmetic number, because the mean of its divisors is an integer number (10670932).

Almost surely, 2^21341863 is an apocalyptic number.

21341863 is a deficient number, since it is larger than the sum of its proper divisors (1).

21341863 is an equidigital number, since it uses as much as digits as its factorization.

21341863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 21341863 is about 4619.7254247412. The cubic root of 21341863 is about 277.3814681935.

The spelling of 21341863 in words is "twenty-one million, three hundred forty-one thousand, eight hundred sixty-three".