1200031320221 has 2 divisors, whose sum is σ = 1200031320222. Its totient is φ = 1200031320220.

The previous prime is 1200031320197. The next prime is 1200031320223. The reversal of 1200031320221 is 1220231300021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 769235997721 + 430795322500 = 877061^2 + 656350^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200031320221 - 2³⁴ = 1182851451037 is a prime.

It is a super-2 number, since 2×1200031320221² (a number of 25 digits) contains 22 as substring.

Together with 1200031320223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200031320221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200031320223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600015660110 + 600015660111.

It is an arithmetic number, because the mean of its divisors is an integer number (600015660111).

Almost surely, 2^{1200031320221} is an apocalyptic number.

It is an amenable number.

1200031320221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200031320221 is an equidigital number, since it uses as much as digits as its factorization.

1200031320221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1200031320221 its reverse (1220231300021), we get a palindrome (2420262620242).

The spelling of 1200031320221 in words is "one trillion, two hundred billion, thirty-one million, three hundred twenty thousand, two hundred twenty-one".