21343339 has 8 divisors (see below), whose sum is σ = 22048208. Its totient is φ = 20645280.

The previous prime is 21343337. The next prime is 21343363. The reversal of 21343339 is 93334312.

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 21343339 - 2¹ = 21343337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21343331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5104 + ... + 8290.

It is an arithmetic number, because the mean of its divisors is an integer number (2756026).

Almost surely, 2^21343339 is an apocalyptic number.

21343339 is a deficient number, since it is larger than the sum of its proper divisors (704869).

21343339 is a wasteful number, since it uses less digits than its factorization.

21343339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3405.

The product of its digits is 5832, while the sum is 28.

The square root of 21343339 is about 4619.8851717332. The cubic root of 21343339 is about 277.3878625994.

Subtracting from 21343339 its sum of digits (28), we obtain a triangular number (21343311 = T₆₅₃₃).

The spelling of 21343339 in words is "twenty-one million, three hundred forty-three thousand, three hundred thirty-nine".