21431211343 has 2 divisors, whose sum is σ = 21431211344. Its totient is φ = 21431211342.

The previous prime is 21431211341. The next prime is 21431211379. The reversal of 21431211343 is 34311213412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21431211343 - 2¹ = 21431211341 is a prime.

Together with 21431211341, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21431211341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715605671 + 10715605672.

It is an arithmetic number, because the mean of its divisors is an integer number (10715605672).

Almost surely, 2^21431211343 is an apocalyptic number.

21431211343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21431211343 is an equidigital number, since it uses as much as digits as its factorization.

21431211343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

Adding to 21431211343 its reverse (34311213412), we get a palindrome (55742424755).

The spelling of 21431211343 in words is "twenty-one billion, four hundred thirty-one million, two hundred eleven thousand, three hundred forty-three".