1321352051221 has 2 divisors, whose sum is σ = 1321352051222. Its totient is φ = 1321352051220.

The previous prime is 1321352051203. The next prime is 1321352051249. The reversal of 1321352051221 is 1221502531231.

It is an a-pointer prime, because the next prime (1321352051249) can be obtained adding 1321352051221 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1235098822500 + 86253228721 = 1111350^2 + 293689^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321352051221 - 2⁵ = 1321352051189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321352051221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321352051291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660676025610 + 660676025611.

It is an arithmetic number, because the mean of its divisors is an integer number (660676025611).

Almost surely, 2^{1321352051221} is an apocalyptic number.

It is an amenable number.

1321352051221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321352051221 is an equidigital number, since it uses as much as digits as its factorization.

1321352051221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 1321352051221 its reverse (1221502531231), we get a palindrome (2542854582452).

The spelling of 1321352051221 in words is "one trillion, three hundred twenty-one billion, three hundred fifty-two million, fifty-one thousand, two hundred twenty-one".