1223420243221 has 24 divisors (see below), whose sum is σ = 1367015975864. Its totient is φ = 1093791600000.

The previous prime is 1223420243197. The next prime is 1223420243251.

1223420243221 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 505358904996 + 718061338225 = 710886^2 + 847385^2 .

It is not a de Polignac number, because 1223420243221 - 2⁵ = 1223420243189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1223420243221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223420243251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73070911 + ... + 73087651.

Almost surely, 2^{1223420243221} is an apocalyptic number.

1223420243221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1223420243221 is a deficient number, since it is larger than the sum of its proper divisors (143595732643).

1223420243221 is a wasteful number, since it uses less digits than its factorization.

1223420243221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26725 (or 26714 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

It can be divided in two parts, 1223420 and 243221, that added together give a palindrome (1466641).

The spelling of 1223420243221 in words is "one trillion, two hundred twenty-three billion, four hundred twenty million, two hundred forty-three thousand, two hundred twenty-one".