21210310343 has 2 divisors, whose sum is σ = 21210310344. Its totient is φ = 21210310342.

The previous prime is 21210310313. The next prime is 21210310351. The reversal of 21210310343 is 34301301212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21210310343 - 2¹⁶ = 21210244807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210310313) 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, 10605155171 + 10605155172.

It is an arithmetic number, because the mean of its divisors is an integer number (10605155172).

Almost surely, 2^21210310343 is an apocalyptic number.

21210310343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210310343 is an equidigital number, since it uses as much as digits as its factorization.

21210310343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21210310343 its reverse (34301301212), we get a palindrome (55511611555).

The spelling of 21210310343 in words is "twenty-one billion, two hundred ten million, three hundred ten thousand, three hundred forty-three".