1222243421 has 4 divisors (see below), whose sum is σ = 1396849632. Its totient is φ = 1047637212.

The previous prime is 1222243409. The next prime is 1222243433. The reversal of 1222243421 is 1243422221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1243422221 = 709 ⋅1753769.

It is an interprime number because it is at equal distance from previous prime (1222243409) and next prime (1222243433).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222243421 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 (1222243471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87303095 + ... + 87303108.

It is an arithmetic number, because the mean of its divisors is an integer number (349212408).

Almost surely, 2^1222243421 is an apocalyptic number.

It is an amenable number.

1222243421 is a deficient number, since it is larger than the sum of its proper divisors (174606211).

1222243421 is an equidigital number, since it uses as much as digits as its factorization.

1222243421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174606210.

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

The square root of 1222243421 is about 34960.5981213137. The cubic root of 1222243421 is about 1069.1842913999.

Adding to 1222243421 its reverse (1243422221), we get a palindrome (2465665642).

The spelling of 1222243421 in words is "one billion, two hundred twenty-two million, two hundred forty-three thousand, four hundred twenty-one".