1201220111121 has 4 divisors (see below), whose sum is σ = 1601626814832. Its totient is φ = 800813407412.

The previous prime is 1201220111101. The next prime is 1201220111123. The reversal of 1201220111121 is 1211110221021.

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 1201220111121 - 2⁹ = 1201220110609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201220111121.

It is not an unprimeable number, because it can be changed into a prime (1201220111123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200203351851 + ... + 200203351856.

It is an arithmetic number, because the mean of its divisors is an integer number (400406703708).

Almost surely, 2^{1201220111121} is an apocalyptic number.

It is an amenable number.

1201220111121 is a deficient number, since it is larger than the sum of its proper divisors (400406703711).

1201220111121 is an equidigital number, since it uses as much as digits as its factorization.

1201220111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400406703710.

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

Adding to 1201220111121 its reverse (1211110221021), we get a palindrome (2412330332142).

The spelling of 1201220111121 in words is "one trillion, two hundred one billion, two hundred twenty million, one hundred eleven thousand, one hundred twenty-one".