21200603 has 2 divisors, whose sum is σ = 21200604. Its totient is φ = 21200602.

The previous prime is 21200579. The next prime is 21200617. The reversal of 21200603 is 30600212.

It is an a-pointer prime, because the next prime (21200617) can be obtained adding 21200603 to its sum of digits (14).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21200603 - 2⁶ = 21200539 is a prime.

It is not a weakly prime, because it can be changed into another prime (21200623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600301 + 10600302.

It is an arithmetic number, because the mean of its divisors is an integer number (10600302).

Almost surely, 2^21200603 is an apocalyptic number.

21200603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200603 is an equidigital number, since it uses as much as digits as its factorization.

21200603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21200603 is about 4604.4112544385. The cubic root of 21200603 is about 276.7681247543.

Adding to 21200603 its reverse (30600212), we get a palindrome (51800815).

The spelling of 21200603 in words is "twenty-one million, two hundred thousand, six hundred three".