1201221220211 has 16 divisors (see below), whose sum is σ = 1227090002880. Its totient is φ = 1175564949120.

The previous prime is 1201221220093. The next prime is 1201221220217. The reversal of 1201221220211 is 1120221221021.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201221220211 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 1201221220211.

It is not an unprimeable number, because it can be changed into a prime (1201221220217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10901330 + ... + 11010968.

It is an arithmetic number, because the mean of its divisors is an integer number (76693125180).

Almost surely, 2^{1201221220211} is an apocalyptic number.

1201221220211 is a deficient number, since it is larger than the sum of its proper divisors (25868782669).

1201221220211 is a wasteful number, since it uses less digits than its factorization.

1201221220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110606.

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

Adding to 1201221220211 its reverse (1120221221021), we get a palindrome (2321442441232).

The spelling of 1201221220211 in words is "one trillion, two hundred one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred eleven".