21003350603 has 4 divisors (see below), whose sum is σ = 21347667888. Its totient is φ = 20659033320.

The previous prime is 21003350579. The next prime is 21003350629. The reversal of 21003350603 is 30605330012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21003350603 - 2¹⁸ = 21003088459 is a prime.

It is a super-2 number, since 2×21003350603² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003350653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172158551 + ... + 172158672.

It is an arithmetic number, because the mean of its divisors is an integer number (5336916972).

Almost surely, 2^21003350603 is an apocalyptic number.

21003350603 is a deficient number, since it is larger than the sum of its proper divisors (344317285).

21003350603 is an equidigital number, since it uses as much as digits as its factorization.

21003350603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344317284.

The product of its (nonzero) digits is 1620, while the sum is 23.

Adding to 21003350603 its reverse (30605330012), we get a palindrome (51608680615).

The spelling of 21003350603 in words is "twenty-one billion, three million, three hundred fifty thousand, six hundred three".