1200121221001 has 2 divisors, whose sum is σ = 1200121221002. Its totient is φ = 1200121221000.

The previous prime is 1200121220971. The next prime is 1200121221007. The reversal of 1200121221001 is 1001221210021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1096083363600 + 104037857401 = 1046940^2 + 322549^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200121221001 - 2¹³ = 1200121212809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200121221007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600060610500 + 600060610501.

It is an arithmetic number, because the mean of its divisors is an integer number (600060610501).

Almost surely, 2^{1200121221001} is an apocalyptic number.

It is an amenable number.

1200121221001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200121221001 is an equidigital number, since it uses as much as digits as its factorization.

1200121221001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1200121221001 its reverse (1001221210021), we get a palindrome (2201342431022).

The spelling of 1200121221001 in words is "one trillion, two hundred billion, one hundred twenty-one million, two hundred twenty-one thousand, one".