21044486 has 4 divisors (see below), whose sum is σ = 31566732. Its totient is φ = 10522242.

The previous prime is 21044479. The next prime is 21044531. The reversal of 21044486 is 68444012.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5261120 + ... + 5261123.

It is an arithmetic number, because the mean of its divisors is an integer number (7891683).

Almost surely, 2^21044486 is an apocalyptic number.

21044486 is a deficient number, since it is larger than the sum of its proper divisors (10522246).

21044486 is a wasteful number, since it uses less digits than its factorization.

21044486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10522245.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 21044486 is about 4587.4269476472. The cubic root of 21044486 is about 276.0870953164.

Adding to 21044486 its reverse (68444012), we get a palindrome (89488498).

The spelling of 21044486 in words is "twenty-one million, forty-four thousand, four hundred eighty-six".