21044344 has 32 divisors (see below), whose sum is σ = 40783680. Its totient is φ = 10174464.

The previous prime is 21044341. The next prime is 21044347. The reversal of 21044344 is 44344012.

It is an interprime number because it is at equal distance from previous prime (21044341) and next prime (21044347).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36184 + ... + 36760.

It is an arithmetic number, because the mean of its divisors is an integer number (1274490).

Almost surely, 2^21044344 is an apocalyptic number.

It is an amenable number.

21044344 is a deficient number, since it is larger than the sum of its proper divisors (19739336).

21044344 is a wasteful number, since it uses less digits than its factorization.

21044344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 21044344 is about 4587.4114705354. The cubic root of 21044344 is about 276.0864743389.

Adding to 21044344 its reverse (44344012), we get a palindrome (65388356).

The spelling of 21044344 in words is "twenty-one million, forty-four thousand, three hundred forty-four".