21440103 has 4 divisors (see below), whose sum is σ = 28586808. Its totient is φ = 14293400.

The previous prime is 21440099. The next prime is 21440119. The reversal of 21440103 is 30104412.

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 21440103 - 2² = 21440099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440183) 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, 3573348 + ... + 3573353.

It is an arithmetic number, because the mean of its divisors is an integer number (7146702).

Almost surely, 2^21440103 is an apocalyptic number.

21440103 is a deficient number, since it is larger than the sum of its proper divisors (7146705).

21440103 is an equidigital number, since it uses as much as digits as its factorization.

21440103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7146704.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21440103 is about 4630.3458834087. The cubic root of 21440103 is about 277.8064271902.

Adding to 21440103 its reverse (30104412), we get a palindrome (51544515).

The spelling of 21440103 in words is "twenty-one million, four hundred forty thousand, one hundred three".