21210304343 has 2 divisors, whose sum is σ = 21210304344. Its totient is φ = 21210304342.

The previous prime is 21210304321. The next prime is 21210304361. The reversal of 21210304343 is 34340301212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21210304343 - 2¹² = 21210300247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210304363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605152171 + 10605152172.

It is an arithmetic number, because the mean of its divisors is an integer number (10605152172).

Almost surely, 2^21210304343 is an apocalyptic number.

21210304343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210304343 is an equidigital number, since it uses as much as digits as its factorization.

21210304343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21210304343 its reverse (34340301212), we get a palindrome (55550605555).

The spelling of 21210304343 in words is "twenty-one billion, two hundred ten million, three hundred four thousand, three hundred forty-three".