21344043 has 16 divisors (see below), whose sum is σ = 32590080. Its totient is φ = 12171936.

The previous prime is 21344033. The next prime is 21344051. The reversal of 21344043 is 34044312.

It is not a de Polignac number, because 21344043 - 2⁶ = 21343979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21344033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16753 + ... + 17981.

It is an arithmetic number, because the mean of its divisors is an integer number (2036880).

Almost surely, 2^21344043 is an apocalyptic number.

21344043 is a deficient number, since it is larger than the sum of its proper divisors (11246037).

21344043 is a wasteful number, since it uses less digits than its factorization.

21344043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 21344043 is about 4619.9613634748. The cubic root of 21344043 is about 277.3909124020.

Adding to 21344043 its reverse (34044312), we get a palindrome (55388355).

The spelling of 21344043 in words is "twenty-one million, three hundred forty-four thousand, forty-three".