1320212311921 has 2 divisors, whose sum is σ = 1320212311922. Its totient is φ = 1320212311920.

The previous prime is 1320212311919. The next prime is 1320212312057. The reversal of 1320212311921 is 1291132120231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1234234343521 + 85977968400 = 1110961^2 + 293220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320212311921 - 2¹ = 1320212311919 is a prime.

Together with 1320212311919, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1320212311921.

It is not a weakly prime, because it can be changed into another prime (1320212311721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660106155960 + 660106155961.

It is an arithmetic number, because the mean of its divisors is an integer number (660106155961).

Almost surely, 2^{1320212311921} is an apocalyptic number.

It is an amenable number.

1320212311921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320212311921 is an equidigital number, since it uses as much as digits as its factorization.

1320212311921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 1320212311921 in words is "one trillion, three hundred twenty billion, two hundred twelve million, three hundred eleven thousand, nine hundred twenty-one".