21441441 has 16 divisors (see below), whose sum is σ = 32859008. Its totient is φ = 12182400.

The previous prime is 21441421. The next prime is 21441449. The reversal of 21441441 is 14414412.

It is not a de Polignac number, because 21441441 - 2⁶ = 21441377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21441449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 981 + ... + 6621.

It is an arithmetic number, because the mean of its divisors is an integer number (2053688).

Almost surely, 2^21441441 is an apocalyptic number.

21441441 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21441441 is a deficient number, since it is larger than the sum of its proper divisors (11417567).

21441441 is a wasteful number, since it uses less digits than its factorization.

21441441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5832.

The product of its digits is 512, while the sum is 21.

The square root of 21441441 is about 4630.4903628018. The cubic root of 21441441 is about 277.8122060379.

Adding to 21441441 its reverse (14414412), we get a palindrome (35855853).

It can be divided in two parts, 2 and 1441441, that multiplied together give a palindrome (2882882).

The spelling of 21441441 in words is "twenty-one million, four hundred forty-one thousand, four hundred forty-one".