1121201211001 has 2 divisors, whose sum is σ = 1121201211002. Its totient is φ = 1121201211000.

The previous prime is 1121201210999. The next prime is 1121201211019. The reversal of 1121201211001 is 1001121021211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1058913031225 + 62288179776 = 1029035^2 + 249576^2 .

It is an emirp because it is prime and its reverse (1001121021211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1121201211001 - 2¹ = 1121201210999 is a prime.

Together with 1121201210999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1121201211071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560600605500 + 560600605501.

It is an arithmetic number, because the mean of its divisors is an integer number (560600605501).

Almost surely, 2^{1121201211001} is an apocalyptic number.

It is an amenable number.

1121201211001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121201211001 is an equidigital number, since it uses as much as digits as its factorization.

1121201211001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1121201211001 its reverse (1001121021211), we get a palindrome (2122322232212).

The spelling of 1121201211001 in words is "one trillion, one hundred twenty-one billion, two hundred one million, two hundred eleven thousand, one".