1321231213207 has 2 divisors, whose sum is σ = 1321231213208. Its totient is φ = 1321231213206.

The previous prime is 1321231213187. The next prime is 1321231213277. The reversal of 1321231213207 is 7023121321231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321231213207 - 2¹¹ = 1321231211159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321231213277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660615606603 + 660615606604.

It is an arithmetic number, because the mean of its divisors is an integer number (660615606604).

Almost surely, 2^{1321231213207} is an apocalyptic number.

1321231213207 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321231213207 is an equidigital number, since it uses as much as digits as its factorization.

1321231213207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

Adding to 1321231213207 its reverse (7023121321231), we get a palindrome (8344352534438).

The spelling of 1321231213207 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-one million, two hundred thirteen thousand, two hundred seven".