1201121000221 has 2 divisors, whose sum is σ = 1201121000222. Its totient is φ = 1201121000220.

The previous prime is 1201121000213. The next prime is 1201121000237. The reversal of 1201121000221 is 1220001211021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 759878324100 + 441242676121 = 871710^2 + 664261^2 .

It is an emirp because it is prime and its reverse (1220001211021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201121000221 - 2³ = 1201121000213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201121000251) 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, 600560500110 + 600560500111.

It is an arithmetic number, because the mean of its divisors is an integer number (600560500111).

Almost surely, 2^{1201121000221} is an apocalyptic number.

It is an amenable number.

1201121000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201121000221 is an equidigital number, since it uses as much as digits as its factorization.

1201121000221 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 1201121000221 its reverse (1220001211021), we get a palindrome (2421122211242).

The spelling of 1201121000221 in words is "one trillion, two hundred one billion, one hundred twenty-one million, two hundred twenty-one", and thus it is an aban number.