1223424221 has 4 divisors (see below), whose sum is σ = 1241684352. Its totient is φ = 1205164092.

The previous prime is 1223424179. The next prime is 1223424239. The reversal of 1223424221 is 1224243221.

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 1223424221 - 2⁶ = 1223424157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223424271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9129965 + ... + 9130098.

It is an arithmetic number, because the mean of its divisors is an integer number (310421088).

Almost surely, 2^1223424221 is an apocalyptic number.

It is an amenable number.

1223424221 is a deficient number, since it is larger than the sum of its proper divisors (18260131).

1223424221 is an equidigital number, since it uses as much as digits as its factorization.

1223424221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18260130.

The product of its digits is 1536, while the sum is 23.

The square root of 1223424221 is about 34977.4816274700. The cubic root of 1223424221 is about 1069.5284908303.

Adding to 1223424221 its reverse (1224243221), we get a palindrome (2447667442).

The spelling of 1223424221 in words is "one billion, two hundred twenty-three million, four hundred twenty-four thousand, two hundred twenty-one".