21343442005 has 8 divisors (see below), whose sum is σ = 25637825592. Its totient is φ = 17057623488.

The previous prime is 21343441993. The next prime is 21343442023. The reversal of 21343442005 is 50024434312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8032282129 + 13311159876 = 89623^2 + 115374^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21343442005 - 2²¹ = 21341344853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2135782 + ... + 2145751.

It is an arithmetic number, because the mean of its divisors is an integer number (3204728199).

Almost surely, 2^21343442005 is an apocalyptic number.

It is an amenable number.

21343442005 is a deficient number, since it is larger than the sum of its proper divisors (4294383587).

21343442005 is an equidigital number, since it uses as much as digits as its factorization.

21343442005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4282535.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 21343442005 its reverse (50024434312), we get a palindrome (71367876317).

The spelling of 21343442005 in words is "twenty-one billion, three hundred forty-three million, four hundred forty-two thousand, five".