1210221221211 has 40 divisors (see below), whose sum is σ = 1847765106000. Its totient is φ = 789153658560.

The previous prime is 1210221221197. The next prime is 1210221221213. The reversal of 1210221221211 is 1121221220121.

1210221221211 is a `hidden beast` number, since 1 + 2 + 10 + 221 + 221 + 211 = 666.

It is not a de Polignac number, because 1210221221211 - 2⁵ = 1210221221179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1210221221213) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 200265 + ... + 1568613.

It is an arithmetic number, because the mean of its divisors is an integer number (46194127650).

Almost surely, 2^{1210221221211} is an apocalyptic number.

1210221221211 is a deficient number, since it is larger than the sum of its proper divisors (637543884789).

1210221221211 is a wasteful number, since it uses less digits than its factorization.

1210221221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368601 (or 1368592 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1210221221211 its reverse (1121221220121), we get a palindrome (2331442441332).

The spelling of 1210221221211 in words is "one trillion, two hundred ten billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred eleven".