21343366 has 16 divisors (see below), whose sum is σ = 35205120. Its totient is φ = 9623880.

The previous prime is 21343363. The next prime is 21343373. The reversal of 21343366 is 66334312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1026 + ... + 6613.

It is an arithmetic number, because the mean of its divisors is an integer number (2200320).

Almost surely, 2^21343366 is an apocalyptic number.

21343366 is a deficient number, since it is larger than the sum of its proper divisors (13861754).

21343366 is a wasteful number, since it uses less digits than its factorization.

21343366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7779.

The product of its digits is 7776, while the sum is 28.

The square root of 21343366 is about 4619.8880938828. Note that the first 3 decimals coincide. The cubic root of 21343366 is about 277.3879795675.

Adding to 21343366 its reverse (66334312), we get a palindrome (87677678).

The spelling of 21343366 in words is "twenty-one million, three hundred forty-three thousand, three hundred sixty-six".