21343406 has 8 divisors (see below), whose sum is σ = 36588720. Its totient is φ = 9147168.

The previous prime is 21343373. The next prime is 21343429. The reversal of 21343406 is 60434312.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 762251 + ... + 762278.

It is an arithmetic number, because the mean of its divisors is an integer number (4573590).

Almost surely, 2^21343406 is an apocalyptic number.

21343406 is a deficient number, since it is larger than the sum of its proper divisors (15245314).

21343406 is a wasteful number, since it uses less digits than its factorization.

21343406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524538.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 21343406 is about 4619.8924229900. The cubic root of 21343406 is about 277.3881528534.

Adding to 21343406 its reverse (60434312), we get a palindrome (81777718).

The spelling of 21343406 in words is "twenty-one million, three hundred forty-three thousand, four hundred six".