21463441 has 4 divisors (see below), whose sum is σ = 22043572. Its totient is φ = 20883312.

The previous prime is 21463427. The next prime is 21463447. The reversal of 21463441 is 14436412.

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 13845841 + 7617600 = 3721^2 + 2760^2 .

It is a cyclic number.

It is not a de Polignac number, because 21463441 - 2¹⁷ = 21332369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21463447) 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, 290010 + ... + 290083.

It is an arithmetic number, because the mean of its divisors is an integer number (5510893).

Almost surely, 2^21463441 is an apocalyptic number.

It is an amenable number.

21463441 is a deficient number, since it is larger than the sum of its proper divisors (580131).

21463441 is an equidigital number, since it uses as much as digits as its factorization.

21463441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580130.

The product of its digits is 2304, while the sum is 25.

The square root of 21463441 is about 4632.8653120936. The cubic root of 21463441 is about 277.9071900047.

Adding to 21463441 its reverse (14436412), we get a palindrome (35899853).

It can be divided in two parts, 21463 and 441, that added together give a square (21904 = 148²).

The spelling of 21463441 in words is "twenty-one million, four hundred sixty-three thousand, four hundred forty-one".