1201221101121 has 32 divisors (see below), whose sum is σ = 1648320589440. Its totient is φ = 777862485504.

The previous prime is 1201221101099. The next prime is 1201221101153. The reversal of 1201221101121 is 1211011221021.

It is a happy number.

It is not a de Polignac number, because 1201221101121 - 2¹⁵ = 1201221068353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201221101121.

It is not an unprimeable number, because it can be changed into a prime (1201221101191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5657875 + ... + 5866343.

It is an arithmetic number, because the mean of its divisors is an integer number (51510018420).

Almost surely, 2^{1201221101121} is an apocalyptic number.

It is an amenable number.

1201221101121 is a deficient number, since it is larger than the sum of its proper divisors (447099488319).

1201221101121 is a wasteful number, since it uses less digits than its factorization.

1201221101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208945.

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

Adding to 1201221101121 its reverse (1211011221021), we get a palindrome (2412232322142).

The spelling of 1201221101121 in words is "one trillion, two hundred one billion, two hundred twenty-one million, one hundred one thousand, one hundred twenty-one".