21043348429 has 2 divisors, whose sum is σ = 21043348430. Its totient is φ = 21043348428.

The previous prime is 21043348427. The next prime is 21043348451. The reversal of 21043348429 is 92484334012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20299695529 + 743652900 = 142477^2 + 27270^2 .

It is a cyclic number.

It is not a de Polignac number, because 21043348429 - 2¹ = 21043348427 is a prime.

Together with 21043348427, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21043348391 and 21043348400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21043348427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521674214 + 10521674215.

It is an arithmetic number, because the mean of its divisors is an integer number (10521674215).

Almost surely, 2^21043348429 is an apocalyptic number.

It is an amenable number.

21043348429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043348429 is an equidigital number, since it uses as much as digits as its factorization.

21043348429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 40.

It can be divided in two parts, 2104 and 3348429, that added together give a palindrome (3350533).

The spelling of 21043348429 in words is "twenty-one billion, forty-three million, three hundred forty-eight thousand, four hundred twenty-nine".