21343333409 has 8 divisors (see below), whose sum is σ = 21455714280. Its totient is φ = 21231248256.

The previous prime is 21343333399. The next prime is 21343333421. The reversal of 21343333409 is 90433334312.

It can be written as a sum of positive squares in 4 ways, for example, as 5892097600 + 15451235809 = 76760^2 + 124303^2 .

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 21343333409 - 2¹² = 21343329313 is a prime.

It is a super-2 number, since 2×21343333409² (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 (21343333489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71549 + ... + 218645.

It is an arithmetic number, because the mean of its divisors is an integer number (2681964285).

Almost surely, 2^21343333409 is an apocalyptic number.

It is an amenable number.

21343333409 is a deficient number, since it is larger than the sum of its proper divisors (112380871).

21343333409 is a wasteful number, since it uses less digits than its factorization.

21343333409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147859.

The product of its (nonzero) digits is 69984, while the sum is 35.

The spelling of 21343333409 in words is "twenty-one billion, three hundred forty-three million, three hundred thirty-three thousand, four hundred nine".