1211221101201 has 16 divisors (see below), whose sum is σ = 1686869708160. Its totient is φ = 772067278080.

The previous prime is 1211221101199. The next prime is 1211221101221. The reversal of 1211221101201 is 1021011221121.

It is a happy number.

It is not a de Polignac number, because 1211221101201 - 2¹ = 1211221101199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211221101221) 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, 67573960 + ... + 67591881.

It is an arithmetic number, because the mean of its divisors is an integer number (105429356760).

Almost surely, 2^{1211221101201} is an apocalyptic number.

It is an amenable number.

1211221101201 is a deficient number, since it is larger than the sum of its proper divisors (475648606959).

1211221101201 is a wasteful number, since it uses less digits than its factorization.

1211221101201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135165976.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211221101201 its reverse (1021011221121), we get a palindrome (2232232322322).

The spelling of 1211221101201 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, one hundred one thousand, two hundred one".