21344011 has 8 divisors (see below), whose sum is σ = 24195920. Its totient is φ = 18664992.

The previous prime is 21343997. The next prime is 21344021. The reversal of 21344011 is 11044312.

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

It is not a de Polignac number, because 21344011 - 2⁵ = 21343979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344021) 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, 42960 + ... + 43453.

It is an arithmetic number, because the mean of its divisors is an integer number (3024490).

Almost surely, 2^21344011 is an apocalyptic number.

21344011 is a deficient number, since it is larger than the sum of its proper divisors (2851909).

21344011 is a wasteful number, since it uses less digits than its factorization.

21344011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86445.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21344011 is about 4619.9579002411. The cubic root of 21344011 is about 277.3907737760.

Adding to 21344011 its reverse (11044312), we get a palindrome (32388323).

The spelling of 21344011 in words is "twenty-one million, three hundred forty-four thousand, eleven".