1200103021321 has 2 divisors, whose sum is σ = 1200103021322. Its totient is φ = 1200103021320.

The previous prime is 1200103021319. The next prime is 1200103021427. The reversal of 1200103021321 is 1231203010021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1135759118400 + 64343902921 = 1065720^2 + 253661^2 .

It is an emirp because it is prime and its reverse (1231203010021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1200103021321 - 2¹ = 1200103021319 is a prime.

Together with 1200103021319, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1200103021295 and 1200103021304.

It is not a weakly prime, because it can be changed into another prime (1200103021121) 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 as a sum of consecutive naturals, namely, 600051510660 + 600051510661.

It is an arithmetic number, because the mean of its divisors is an integer number (600051510661).

Almost surely, 2^{1200103021321} is an apocalyptic number.

It is an amenable number.

1200103021321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200103021321 is an equidigital number, since it uses as much as digits as its factorization.

1200103021321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1200103021321 its reverse (1231203010021), we get a palindrome (2431306031342).

The spelling of 1200103021321 in words is "one trillion, two hundred billion, one hundred three million, twenty-one thousand, three hundred twenty-one".