1221011121103 has 4 divisors (see below), whose sum is σ = 1223409964680. Its totient is φ = 1218612277528.

The previous prime is 1221011121101. The next prime is 1221011121179. The reversal of 1221011121103 is 3011211101221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221011121103 - 2¹ = 1221011121101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221011121101) 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, 1199421025 + ... + 1199422042.

It is an arithmetic number, because the mean of its divisors is an integer number (305852491170).

Almost surely, 2^{1221011121103} is an apocalyptic number.

1221011121103 is a deficient number, since it is larger than the sum of its proper divisors (2398843577).

1221011121103 is an equidigital number, since it uses as much as digits as its factorization.

1221011121103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398843576.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1221011121103 its reverse (3011211101221), we get a palindrome (4232222222324).

The spelling of 1221011121103 in words is "one trillion, two hundred twenty-one billion, eleven million, one hundred twenty-one thousand, one hundred three".