21425603 has 2 divisors, whose sum is σ = 21425604. Its totient is φ = 21425602.

The previous prime is 21425587. The next prime is 21425639. The reversal of 21425603 is 30652412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21425603 - 2⁴ = 21425587 is a prime.

It is not a weakly prime, because it can be changed into another prime (21425003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712801 + 10712802.

It is an arithmetic number, because the mean of its divisors is an integer number (10712802).

Almost surely, 2^21425603 is an apocalyptic number.

21425603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425603 is an equidigital number, since it uses as much as digits as its factorization.

21425603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 21425603 is about 4628.7798608273. The cubic root of 21425603 is about 277.7437859858.

The spelling of 21425603 in words is "twenty-one million, four hundred twenty-five thousand, six hundred three".