21430003 has 12 divisors (see below), whose sum is σ = 25539192. Its totient is φ = 17918880.

The previous prime is 21429937. The next prime is 21430007. The reversal of 21430003 is 30003412.

It is not a de Polignac number, because 21430003 - 2¹⁷ = 21298931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21430007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3325 + ... + 7342.

It is an arithmetic number, because the mean of its divisors is an integer number (2128266).

Almost surely, 2^21430003 is an apocalyptic number.

21430003 is a deficient number, since it is larger than the sum of its proper divisors (4109189).

21430003 is a wasteful number, since it uses less digits than its factorization.

21430003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10722 (or 10715 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21430003 is about 4629.2551236673. The cubic root of 21430003 is about 277.7627973373.

Adding to 21430003 its reverse (30003412), we get a palindrome (51433415).

The spelling of 21430003 in words is "twenty-one million, four hundred thirty thousand, three".