1201111221201 has 4 divisors (see below), whose sum is σ = 1601481628272. Its totient is φ = 800740814132.

The previous prime is 1201111221151. The next prime is 1201111221221. The reversal of 1201111221201 is 1021221111021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1201111221201 - 2⁶ = 1201111221137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201111221221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200185203531 + ... + 200185203536.

It is an arithmetic number, because the mean of its divisors is an integer number (400370407068).

Almost surely, 2^{1201111221201} is an apocalyptic number.

It is an amenable number.

1201111221201 is a deficient number, since it is larger than the sum of its proper divisors (400370407071).

1201111221201 is an equidigital number, since it uses as much as digits as its factorization.

1201111221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400370407070.

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

Adding to 1201111221201 its reverse (1021221111021), we get a palindrome (2222332332222).

The spelling of 1201111221201 in words is "one trillion, two hundred one billion, one hundred eleven million, two hundred twenty-one thousand, two hundred one".