21425003 has 2 divisors, whose sum is σ = 21425004. Its totient is φ = 21425002.

The previous prime is 21424973. The next prime is 21425009. The reversal of 21425003 is 30052412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21425003 - 2¹⁰ = 21423979 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21425009) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712501 + 10712502.

It is an arithmetic number, because the mean of its divisors is an integer number (10712502).

Almost surely, 2^21425003 is an apocalyptic number.

21425003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425003 is an equidigital number, since it uses as much as digits as its factorization.

21425003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21425003 is about 4628.7150484773. The cubic root of 21425003 is about 277.7411933271.

Adding to 21425003 its reverse (30052412), we get a palindrome (51477415).

The spelling of 21425003 in words is "twenty-one million, four hundred twenty-five thousand, three".