21031441 has 4 divisors (see below), whose sum is σ = 21224500. Its totient is φ = 20838384.

The previous prime is 21031433. The next prime is 21031457. The reversal of 21031441 is 14413012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14250625 + 6780816 = 3775^2 + 2604^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031441 - 2³ = 21031433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031421) 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, 96366 + ... + 96583.

It is an arithmetic number, because the mean of its divisors is an integer number (5306125).

Almost surely, 2^21031441 is an apocalyptic number.

It is an amenable number.

21031441 is a deficient number, since it is larger than the sum of its proper divisors (193059).

21031441 is a wasteful number, since it uses less digits than its factorization.

21031441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193058.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21031441 is about 4586.0049062337. The cubic root of 21031441 is about 276.0300368136.

Adding to 21031441 its reverse (14413012), we get a palindrome (35444453).

The spelling of 21031441 in words is "twenty-one million, thirty-one thousand, four hundred forty-one".