1221123221233 has 4 divisors (see below), whose sum is σ = 1221125537088. Its totient is φ = 1221120905380.

The previous prime is 1221123221179. The next prime is 1221123221267. The reversal of 1221123221233 is 3321223211221.

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 1221123221233 - 2⁹ = 1221123220721 is a prime.

It is a super-2 number, since 2×1221123221233² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221123221198 and 1221123221207.

It is not an unprimeable number, because it can be changed into a prime (1221123225233) 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, 60060 + ... + 1563922.

It is an arithmetic number, because the mean of its divisors is an integer number (305281384272).

Almost surely, 2^{1221123221233} is an apocalyptic number.

It is an amenable number.

1221123221233 is a deficient number, since it is larger than the sum of its proper divisors (2315855).

1221123221233 is an equidigital number, since it uses as much as digits as its factorization.

1221123221233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315854.

The product of its digits is 1728, while the sum is 25.

Adding to 1221123221233 its reverse (3321223211221), we get a palindrome (4542346432454).

The spelling of 1221123221233 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-three million, two hundred twenty-one thousand, two hundred thirty-three".