1321100001121 has 2 divisors, whose sum is σ = 1321100001122. Its totient is φ = 1321100001120.

The previous prime is 1321100001103. The next prime is 1321100001211. The reversal of 1321100001121 is 1211000011231.

It is a happy number.

Together with next prime (1321100001211) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1305683302225 + 15416698896 = 1142665^2 + 124164^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321100001121 - 2¹⁷ = 1321099870049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321100001721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660550000560 + 660550000561.

It is an arithmetic number, because the mean of its divisors is an integer number (660550000561).

Almost surely, 2^{1321100001121} is an apocalyptic number.

It is an amenable number.

1321100001121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321100001121 is an equidigital number, since it uses as much as digits as its factorization.

1321100001121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 1321100001121 its reverse (1211000011231), we get a palindrome (2532100012352).

The spelling of 1321100001121 in words is "one trillion, three hundred twenty-one billion, one hundred million, one thousand, one hundred twenty-one".