1201221212201 has 4 divisors (see below), whose sum is σ = 1201225952004. Its totient is φ = 1201216472400.

The previous prime is 1201221212171. The next prime is 1201221212239. The reversal of 1201221212201 is 1022121221021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 940610962201 + 260610250000 = 969851^2 + 510500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201221212201 - 2¹⁸ = 1201220950057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201221212201.

It is not an unprimeable number, because it can be changed into a prime (1201221212291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1966910 + ... + 2504231.

It is an arithmetic number, because the mean of its divisors is an integer number (300306488001).

Almost surely, 2^{1201221212201} is an apocalyptic number.

It is an amenable number.

1201221212201 is a deficient number, since it is larger than the sum of its proper divisors (4739803).

1201221212201 is an equidigital number, since it uses as much as digits as its factorization.

1201221212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4739802.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1201221212201 its reverse (1022121221021), we get a palindrome (2223342433222).

The spelling of 1201221212201 in words is "one trillion, two hundred one billion, two hundred twenty-one million, two hundred twelve thousand, two hundred one".