21344844 has 24 divisors (see below), whose sum is σ = 49932288. Its totient is φ = 7096720.

The previous prime is 21344839. The next prime is 21344857. The reversal of 21344844 is 44844312.

It is an unprimeable number.

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, 3109 + ... + 7235.

It is an arithmetic number, because the mean of its divisors is an integer number (2080512).

Almost surely, 2^21344844 is an apocalyptic number.

It is an amenable number.

21344844 is an abundant number, since it is smaller than the sum of its proper divisors (28587444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21344844 is a wasteful number, since it uses less digits than its factorization.

21344844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4565 (or 4563 counting only the distinct ones).

The product of its digits is 12288, while the sum is 30.

The square root of 21344844 is about 4620.0480516982. The cubic root of 21344844 is about 277.3943823372.

It can be divided in two parts, 21 and 344844, that added together give a triangular number (344865 = T₈₃₀).

The spelling of 21344844 in words is "twenty-one million, three hundred forty-four thousand, eight hundred forty-four".