21443103 has 64 divisors (see below), whose sum is σ = 38154240. Its totient is φ = 11750400.

The previous prime is 21443099. The next prime is 21443119. The reversal of 21443103 is 30134412.

It is not a de Polignac number, because 21443103 - 2² = 21443099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443183) 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 63 ways as a sum of consecutive naturals, for example, 156451 + ... + 156587.

It is an arithmetic number, because the mean of its divisors is an integer number (596160).

Almost surely, 2^21443103 is an apocalyptic number.

21443103 is a deficient number, since it is larger than the sum of its proper divisors (16711137).

21443103 is a wasteful number, since it uses less digits than its factorization.

21443103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21443103 is about 4630.6698219588. The cubic root of 21443103 is about 277.8193839130.

Adding to 21443103 its reverse (30134412), we get a palindrome (51577515).

The spelling of 21443103 in words is "twenty-one million, four hundred forty-three thousand, one hundred three".