1200031201321 has 2 divisors, whose sum is σ = 1200031201322. Its totient is φ = 1200031201320.

The previous prime is 1200031201289. The next prime is 1200031201387. The reversal of 1200031201321 is 1231021300021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1154636211600 + 45394989721 = 1074540^2 + 213061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200031201321 - 2⁵ = 1200031201289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200031201295 and 1200031201304.

It is not a weakly prime, because it can be changed into another prime (1200031201021) 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, 600015600660 + 600015600661.

It is an arithmetic number, because the mean of its divisors is an integer number (600015600661).

Almost surely, 2^{1200031201321} is an apocalyptic number.

It is an amenable number.

1200031201321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200031201321 is an equidigital number, since it uses as much as digits as its factorization.

1200031201321 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 1200031201321 its reverse (1231021300021), we get a palindrome (2431052501342).

The spelling of 1200031201321 in words is "one trillion, two hundred billion, thirty-one million, two hundred one thousand, three hundred twenty-one".