21094503 has 16 divisors (see below), whose sum is σ = 29902080. Its totient is φ = 13189824.

The previous prime is 21094483. The next prime is 21094511. The reversal of 21094503 is 30549012.

It is not a de Polignac number, because 21094503 - 2¹³ = 21086311 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21094523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4075 + ... + 7667.

It is an arithmetic number, because the mean of its divisors is an integer number (1868880).

Almost surely, 2^21094503 is an apocalyptic number.

21094503 is a deficient number, since it is larger than the sum of its proper divisors (8807577).

21094503 is a wasteful number, since it uses less digits than its factorization.

21094503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3718.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 21094503 is about 4592.8752432436. The cubic root of 21094503 is about 276.3056501524.

The spelling of 21094503 in words is "twenty-one million, ninety-four thousand, five hundred three".