21013044343 has 2 divisors, whose sum is σ = 21013044344. Its totient is φ = 21013044342.

The previous prime is 21013044323. The next prime is 21013044449. The reversal of 21013044343 is 34344031012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21013044343 - 2²⁵ = 20979489911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21013044323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506522171 + 10506522172.

It is an arithmetic number, because the mean of its divisors is an integer number (10506522172).

Almost surely, 2^21013044343 is an apocalyptic number.

21013044343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013044343 is an equidigital number, since it uses as much as digits as its factorization.

21013044343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21013044343 its reverse (34344031012), we get a palindrome (55357075355).

The spelling of 21013044343 in words is "twenty-one billion, thirteen million, forty-four thousand, three hundred forty-three".