21241404343 has 2 divisors, whose sum is σ = 21241404344. Its totient is φ = 21241404342.

The previous prime is 21241404299. The next prime is 21241404347. The reversal of 21241404343 is 34340414212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21241404343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21241404347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620702171 + 10620702172.

It is an arithmetic number, because the mean of its divisors is an integer number (10620702172).

Almost surely, 2^21241404343 is an apocalyptic number.

21241404343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241404343 is an equidigital number, since it uses as much as digits as its factorization.

21241404343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21241404343 its reverse (34340414212), we get a palindrome (55581818555).

The spelling of 21241404343 in words is "twenty-one billion, two hundred forty-one million, four hundred four thousand, three hundred forty-three".