2121603310603 has 24 divisors (see below), whose sum is σ = 2599270757520. Its totient is φ = 1721884469760.

The previous prime is 2121603310571. The next prime is 2121603310613. The reversal of 2121603310603 is 3060133061212.

It is not a de Polignac number, because 2121603310603 - 2⁵ = 2121603310571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121603310613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1135423 + ... + 2352103.

It is an arithmetic number, because the mean of its divisors is an integer number (108302948230).

Almost surely, 2^{2121603310603} is an apocalyptic number.

2121603310603 is a deficient number, since it is larger than the sum of its proper divisors (477667446917).

2121603310603 is a wasteful number, since it uses less digits than its factorization.

2121603310603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218587 (or 1218580 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 2121603310603 its reverse (3060133061212), we get a palindrome (5181736371815).

The spelling of 2121603310603 in words is "two trillion, one hundred twenty-one billion, six hundred three million, three hundred ten thousand, six hundred three".