1221102121223 has 4 divisors (see below), whose sum is σ = 1221856355160. Its totient is φ = 1220347887288.

The previous prime is 1221102121219. The next prime is 1221102121229. The reversal of 1221102121223 is 3221212011221.

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 1221102121223 - 2² = 1221102121219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221102121195 and 1221102121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221102121229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377114540 + ... + 377117777.

It is an arithmetic number, because the mean of its divisors is an integer number (305464088790).

Almost surely, 2^{1221102121223} is an apocalyptic number.

1221102121223 is a deficient number, since it is larger than the sum of its proper divisors (754233937).

1221102121223 is an equidigital number, since it uses as much as digits as its factorization.

1221102121223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754233936.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1221102121223 its reverse (3221212011221), we get a palindrome (4442314132444).

The spelling of 1221102121223 in words is "one trillion, two hundred twenty-one billion, one hundred two million, one hundred twenty-one thousand, two hundred twenty-three".