1221021130223 has 4 divisors (see below), whose sum is σ = 1221023892648. Its totient is φ = 1221018367800.

The previous prime is 1221021130169. The next prime is 1221021130237. The reversal of 1221021130223 is 3220311201221.

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 1221021130223 - 2⁶ = 1221021130159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221021130195 and 1221021130204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221021130243) 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, 552428 + ... + 1657473.

It is an arithmetic number, because the mean of its divisors is an integer number (305255973162).

Almost surely, 2^{1221021130223} is an apocalyptic number.

1221021130223 is a deficient number, since it is larger than the sum of its proper divisors (2762425).

1221021130223 is an equidigital number, since it uses as much as digits as its factorization.

1221021130223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2762424.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1221021130223 its reverse (3220311201221), we get a palindrome (4441332331444).

The spelling of 1221021130223 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred thirty thousand, two hundred twenty-three".