1221103023121 has 4 divisors (see below), whose sum is σ = 1221558151792. Its totient is φ = 1220647894452.

The previous prime is 1221103023103. The next prime is 1221103023157. The reversal of 1221103023121 is 1213203011221.

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 1221103023121 - 2¹⁷ = 1221102892049 is a prime.

It is a super-3 number, since 3×1221103023121³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221103023521) 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, 227560311 + ... + 227565676.

It is an arithmetic number, because the mean of its divisors is an integer number (305389537948).

Almost surely, 2^{1221103023121} is an apocalyptic number.

It is an amenable number.

1221103023121 is a deficient number, since it is larger than the sum of its proper divisors (455128671).

1221103023121 is an equidigital number, since it uses as much as digits as its factorization.

1221103023121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455128670.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1221103023121 its reverse (1213203011221), we get a palindrome (2434306034342).

The spelling of 1221103023121 in words is "one trillion, two hundred twenty-one billion, one hundred three million, twenty-three thousand, one hundred twenty-one".