21430443247 has 2 divisors, whose sum is σ = 21430443248. Its totient is φ = 21430443246.

The previous prime is 21430443227. The next prime is 21430443277. The reversal of 21430443247 is 74234403412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21430443247 - 2⁷ = 21430443119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21430443227) 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, 10715221623 + 10715221624.

It is an arithmetic number, because the mean of its divisors is an integer number (10715221624).

Almost surely, 2^21430443247 is an apocalyptic number.

21430443247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21430443247 is an equidigital number, since it uses as much as digits as its factorization.

21430443247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 34.

Adding to 21430443247 its reverse (74234403412), we get a palindrome (95664846659).

The spelling of 21430443247 in words is "twenty-one billion, four hundred thirty million, four hundred forty-three thousand, two hundred forty-seven".