2121603621017 has 16 divisors (see below), whose sum is σ = 2262716104320. Its totient is φ = 1982305535232.

The previous prime is 2121603620971. The next prime is 2121603621061. The reversal of 2121603621017 is 7101263061212.

It is a cyclic number.

It is not a de Polignac number, because 2121603621017 - 2¹⁸ = 2121603358873 is a prime.

It is a super-2 number, since 2×2121603621017² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121603621217) 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 15 ways as a sum of consecutive naturals, for example, 68660423 + ... + 68691315.

It is an arithmetic number, because the mean of its divisors is an integer number (141419756520).

Almost surely, 2^{2121603621017} is an apocalyptic number.

It is an amenable number.

2121603621017 is a deficient number, since it is larger than the sum of its proper divisors (141112483303).

2121603621017 is a wasteful number, since it uses less digits than its factorization.

2121603621017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60112.

The product of its (nonzero) digits is 6048, while the sum is 32.

Adding to 2121603621017 its reverse (7101263061212), we get a palindrome (9222866682229).

The spelling of 2121603621017 in words is "two trillion, one hundred twenty-one billion, six hundred three million, six hundred twenty-one thousand, seventeen".