21434344 has 16 divisors (see below), whose sum is σ = 41937120. Its totient is φ = 10251120.

The previous prime is 21434341. The next prime is 21434353. The reversal of 21434344 is 44343412.

It is a super-2 number, since 2×21434344² = 918862205420672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21434341) 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 3 ways as a sum of consecutive naturals, for example, 58062 + ... + 58429.

It is an arithmetic number, because the mean of its divisors is an integer number (2621070).

Almost surely, 2^21434344 is an apocalyptic number.

It is an amenable number.

21434344 is a deficient number, since it is larger than the sum of its proper divisors (20502776).

21434344 is a wasteful number, since it uses less digits than its factorization.

21434344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116520 (or 116516 counting only the distinct ones).

The product of its digits is 4608, while the sum is 25.

The square root of 21434344 is about 4629.7239658537. The cubic root of 21434344 is about 277.7815512139.

Adding to 21434344 its reverse (44343412), we get a palindrome (65777756).

The spelling of 21434344 in words is "twenty-one million, four hundred thirty-four thousand, three hundred forty-four".