21221560420603 has 2 divisors, whose sum is σ = 21221560420604. Its totient is φ = 21221560420602.

The previous prime is 21221560420601. The next prime is 21221560420637. The reversal of 21221560420603 is 30602406512212.

It is an a-pointer prime, because the next prime (21221560420637) can be obtained adding 21221560420603 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221560420603 - 2¹ = 21221560420601 is a prime.

Together with 21221560420601, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21221560420601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610780210301 + 10610780210302.

It is an arithmetic number, because the mean of its divisors is an integer number (10610780210302).

Almost surely, 2^{21221560420603} is an apocalyptic number.

21221560420603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221560420603 is an equidigital number, since it uses as much as digits as its factorization.

21221560420603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 21221560420603 its reverse (30602406512212), we get a palindrome (51823966932815).

The spelling of 21221560420603 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred sixty million, four hundred twenty thousand, six hundred three".