4223221432421 has 2 divisors, whose sum is σ = 4223221432422. Its totient is φ = 4223221432420.

The previous prime is 4223221432403. The next prime is 4223221432487. The reversal of 4223221432421 is 1242341223224.

4223221432421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3749896696225 + 473324736196 = 1936465^2 + 687986^2 .

It is a cyclic number.

It is not a de Polignac number, because 4223221432421 - 2¹⁰ = 4223221431397 is a prime.

It is a Sophie Germain 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 (4223221432321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2111610716210 + 2111610716211.

It is an arithmetic number, because the mean of its divisors is an integer number (2111610716211).

Almost surely, 2^{4223221432421} is an apocalyptic number.

It is an amenable number.

4223221432421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4223221432421 is an equidigital number, since it uses as much as digits as its factorization.

4223221432421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 32.

Adding to 4223221432421 its reverse (1242341223224), we get a palindrome (5465562655645).

The spelling of 4223221432421 in words is "four trillion, two hundred twenty-three billion, two hundred twenty-one million, four hundred thirty-two thousand, four hundred twenty-one".