21435347 has 2 divisors, whose sum is σ = 21435348. Its totient is φ = 21435346.

The previous prime is 21435341. The next prime is 21435389. The reversal of 21435347 is 74353412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21435347 - 2¹⁰ = 21434323 is a prime.

It is not a weakly prime, because it can be changed into another prime (21435341) 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, 10717673 + 10717674.

It is an arithmetic number, because the mean of its divisors is an integer number (10717674).

Almost surely, 2^21435347 is an apocalyptic number.

21435347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21435347 is an equidigital number, since it uses as much as digits as its factorization.

21435347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 29.

The square root of 21435347 is about 4629.8322863793. The cubic root of 21435347 is about 277.7858839886.

Adding to 21435347 its reverse (74353412), we get a palindrome (95788759).

The spelling of 21435347 in words is "twenty-one million, four hundred thirty-five thousand, three hundred forty-seven".