21334404409 has 4 divisors (see below), whose sum is σ = 21342796416. Its totient is φ = 21326012404.

The previous prime is 21334404379. The next prime is 21334404433. The reversal of 21334404409 is 90440443312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21334404409 - 2¹³ = 21334396217 is a prime.

It is a super-2 number, since 2×21334404409² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21334404709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4192189 + ... + 4197274.

It is an arithmetic number, because the mean of its divisors is an integer number (5335699104).

Almost surely, 2^21334404409 is an apocalyptic number.

It is an amenable number.

21334404409 is a deficient number, since it is larger than the sum of its proper divisors (8392007).

21334404409 is an equidigital number, since it uses as much as digits as its factorization.

21334404409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8392006.

The product of its (nonzero) digits is 41472, while the sum is 34.

The spelling of 21334404409 in words is "twenty-one billion, three hundred thirty-four million, four hundred four thousand, four hundred nine".