21404024347 has 2 divisors, whose sum is σ = 21404024348. Its totient is φ = 21404024346.

The previous prime is 21404024311. The next prime is 21404024351. The reversal of 21404024347 is 74342040412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21404024347 - 2¹⁹ = 21403500059 is a prime.

It is not a weakly prime, because it can be changed into another prime (21404021347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702012173 + 10702012174.

It is an arithmetic number, because the mean of its divisors is an integer number (10702012174).

Almost surely, 2^21404024347 is an apocalyptic number.

21404024347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404024347 is an equidigital number, since it uses as much as digits as its factorization.

21404024347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 31.

Adding to 21404024347 its reverse (74342040412), we get a palindrome (95746064759).

The spelling of 21404024347 in words is "twenty-one billion, four hundred four million, twenty-four thousand, three hundred forty-seven".