21044476 has 12 divisors (see below), whose sum is σ = 38766280. Its totient is φ = 9968400.

The previous prime is 21044473. The next prime is 21044477. The reversal of 21044476 is 67444012.

It is a super-2 number, since 2×21044476² = 885739940229152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138375 + ... + 138526.

Almost surely, 2^21044476 is an apocalyptic number.

It is an amenable number.

21044476 is a deficient number, since it is larger than the sum of its proper divisors (17721804).

21044476 is a wasteful number, since it uses less digits than its factorization.

21044476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276924 (or 276922 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 21044476 is about 4587.4258577115. The cubic root of 21044476 is about 276.0870515857.

Adding to 21044476 its reverse (67444012), we get a palindrome (88488488).

The spelling of 21044476 in words is "twenty-one million, forty-four thousand, four hundred seventy-six".