21445603 has 2 divisors, whose sum is σ = 21445604. Its totient is φ = 21445602.

The previous prime is 21445597. The next prime is 21445609. The reversal of 21445603 is 30654412.

It is a balanced prime because it is at equal distance from previous prime (21445597) and next prime (21445609).

It is a cyclic number.

It is not a de Polignac number, because 21445603 - 2¹³ = 21437411 is a prime.

It is not a weakly prime, because it can be changed into another prime (21445609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722801 + 10722802.

It is an arithmetic number, because the mean of its divisors is an integer number (10722802).

Almost surely, 2^21445603 is an apocalyptic number.

21445603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21445603 is an equidigital number, since it uses as much as digits as its factorization.

21445603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 21445603 is about 4630.9397534410. The cubic root of 21445603 is about 277.8301802589.

The spelling of 21445603 in words is "twenty-one million, four hundred forty-five thousand, six hundred three".