1221033310223 has 4 divisors (see below), whose sum is σ = 1221049119360. Its totient is φ = 1221017501088.

The previous prime is 1221033310177. The next prime is 1221033310243. The reversal of 1221033310223 is 3220133301221.

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 1221033310223 - 2³² = 1216738342927 is a prime.

It is a super-4 number, since 4×1221033310223⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221033310243) 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, 7788143 + ... + 7943376.

It is an arithmetic number, because the mean of its divisors is an integer number (305262279840).

Almost surely, 2^{1221033310223} is an apocalyptic number.

1221033310223 is a deficient number, since it is larger than the sum of its proper divisors (15809137).

1221033310223 is an equidigital number, since it uses as much as digits as its factorization.

1221033310223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15809136.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 1221033310223 its reverse (3220133301221), we get a palindrome (4441166611444).

The spelling of 1221033310223 in words is "one trillion, two hundred twenty-one billion, thirty-three million, three hundred ten thousand, two hundred twenty-three".