21441363 has 4 divisors (see below), whose sum is σ = 28588488. Its totient is φ = 14294240.

The previous prime is 21441347. The next prime is 21441373. The reversal of 21441363 is 36314412.

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

It is a cyclic number.

It is not a de Polignac number, because 21441363 - 2⁴ = 21441347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21441323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3573558 + ... + 3573563.

It is an arithmetic number, because the mean of its divisors is an integer number (7147122).

Almost surely, 2^21441363 is an apocalyptic number.

21441363 is a deficient number, since it is larger than the sum of its proper divisors (7147125).

21441363 is an equidigital number, since it uses as much as digits as its factorization.

21441363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7147124.

The product of its digits is 1728, while the sum is 24.

The square root of 21441363 is about 4630.4819403600. The cubic root of 21441363 is about 277.8118691610.

Adding to 21441363 its reverse (36314412), we get a palindrome (57755775).

The spelling of 21441363 in words is "twenty-one million, four hundred forty-one thousand, three hundred sixty-three".