21368044 has 6 divisors (see below), whose sum is σ = 37394084. Its totient is φ = 10684020.

The previous prime is 21368029. The next prime is 21368047. The reversal of 21368044 is 44086312.

It is not an unprimeable number, because it can be changed into a prime (21368047) by changing a digit.

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 as a sum of consecutive naturals, namely, 2671002 + ... + 2671009.

Almost surely, 2^21368044 is an apocalyptic number.

It is an amenable number.

21368044 is a deficient number, since it is larger than the sum of its proper divisors (16026040).

21368044 is a wasteful number, since it uses less digits than its factorization.

21368044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5342015 (or 5342013 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 21368044 is about 4622.5581662106. The cubic root of 21368044 is about 277.4948471840.

The spelling of 21368044 in words is "twenty-one million, three hundred sixty-eight thousand, forty-four".