21044386 has 16 divisors (see below), whose sum is σ = 34525440. Its totient is φ = 9540880.

The previous prime is 21044383. The next prime is 21044389. The reversal of 21044386 is 68344012.

It is an interprime number because it is at equal distance from previous prime (21044383) and next prime (21044389).

It is not an unprimeable number, because it can be changed into a prime (21044383) 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, 9540 + ... + 11536.

It is an arithmetic number, because the mean of its divisors is an integer number (2157840).

Almost surely, 2^21044386 is an apocalyptic number.

21044386 is a deficient number, since it is larger than the sum of its proper divisors (13481054).

21044386 is a wasteful number, since it uses less digits than its factorization.

21044386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489.

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

The square root of 21044386 is about 4587.4160482782. The cubic root of 21044386 is about 276.0866580086.

Adding to 21044386 its reverse (68344012), we get a palindrome (89388398).

The spelling of 21044386 in words is "twenty-one million, forty-four thousand, three hundred eighty-six".