1200011122001 has 2 divisors, whose sum is σ = 1200011122002. Its totient is φ = 1200011122000.

The previous prime is 1200011121997. The next prime is 1200011122003. The reversal of 1200011122001 is 1002211100021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1137635560000 + 62375562001 = 1066600^2 + 249751^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200011122001 - 2² = 1200011121997 is a prime.

Together with 1200011122003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1200011122003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600005561000 + 600005561001.

It is an arithmetic number, because the mean of its divisors is an integer number (600005561001).

Almost surely, 2^{1200011122001} is an apocalyptic number.

It is an amenable number.

1200011122001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200011122001 is an equidigital number, since it uses as much as digits as its factorization.

1200011122001 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 11.

Adding to 1200011122001 its reverse (1002211100021), we get a palindrome (2202222222022).

The spelling of 1200011122001 in words is "one trillion, two hundred billion, eleven million, one hundred twenty-two thousand, one".