1321337675221 has 2 divisors, whose sum is σ = 1321337675222. Its totient is φ = 1321337675220.

The previous prime is 1321337675153. The next prime is 1321337675269. The reversal of 1321337675221 is 1225767331231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1275160392900 + 46177282321 = 1129230^2 + 214889^2 .

It is an emirp because it is prime and its reverse (1225767331231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321337675221 - 2²⁵ = 1321304120789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321337670221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660668837610 + 660668837611.

It is an arithmetic number, because the mean of its divisors is an integer number (660668837611).

Almost surely, 2^{1321337675221} is an apocalyptic number.

It is an amenable number.

1321337675221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321337675221 is an equidigital number, since it uses as much as digits as its factorization.

1321337675221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 43.

The spelling of 1321337675221 in words is "one trillion, three hundred twenty-one billion, three hundred thirty-seven million, six hundred seventy-five thousand, two hundred twenty-one".