21341839 has 2 divisors, whose sum is σ = 21341840. Its totient is φ = 21341838.

The previous prime is 21341833. The next prime is 21341863. The reversal of 21341839 is 93814312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21341839 - 2¹⁷ = 21210767 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21341839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21341833) 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, 10670919 + 10670920.

It is an arithmetic number, because the mean of its divisors is an integer number (10670920).

Almost surely, 2^21341839 is an apocalyptic number.

21341839 is a deficient number, since it is larger than the sum of its proper divisors (1).

21341839 is an equidigital number, since it uses as much as digits as its factorization.

21341839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 21341839 is about 4619.7228271835. The cubic root of 21341839 is about 277.3813642169.

The spelling of 21341839 in words is "twenty-one million, three hundred forty-one thousand, eight hundred thirty-nine".