1220344421 has 2 divisors, whose sum is σ = 1220344422. Its totient is φ = 1220344420.

The previous prime is 1220344403. The next prime is 1220344423. The reversal of 1220344421 is 1244430221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1149549025 + 70795396 = 33905^2 + 8414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220344421 - 2¹⁴ = 1220328037 is a prime.

It is a Sophie Germain prime.

Together with 1220344423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220344423) 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 as a sum of consecutive naturals, namely, 610172210 + 610172211.

It is an arithmetic number, because the mean of its divisors is an integer number (610172211).

Almost surely, 2^1220344421 is an apocalyptic number.

It is an amenable number.

1220344421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220344421 is an equidigital number, since it uses as much as digits as its factorization.

1220344421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1220344421 is about 34933.4284174915. The cubic root of 1220344421 is about 1068.6302737147.

Adding to 1220344421 its reverse (1244430221), we get a palindrome (2464774642).

The spelling of 1220344421 in words is "one billion, two hundred twenty million, three hundred forty-four thousand, four hundred twenty-one".