21044331 has 24 divisors (see below), whose sum is σ = 37899264. Its totient is φ = 10931760.

The previous prime is 21044311. The next prime is 21044341. The reversal of 21044331 is 13344012.

It is not a de Polignac number, because 21044331 - 2¹¹ = 21042283 is a prime.

It is a super-2 number, since 2×21044331² = 885727734475122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21044311) 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 in 23 ways as a sum of consecutive naturals, for example, 14491 + ... + 15876.

It is an arithmetic number, because the mean of its divisors is an integer number (1579136).

Almost surely, 2^21044331 is an apocalyptic number.

21044331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21044331 is a deficient number, since it is larger than the sum of its proper divisors (16854933).

21044331 is a wasteful number, since it uses less digits than its factorization.

21044331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30391 (or 30388 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21044331 is about 4587.4100536141. The cubic root of 21044331 is about 276.0864174887.

Adding to 21044331 its reverse (13344012), we get a palindrome (34388343).

The spelling of 21044331 in words is "twenty-one million, forty-four thousand, three hundred thirty-one".