43444422421 has 2 divisors, whose sum is σ = 43444422422. Its totient is φ = 43444422420.

The previous prime is 43444422409. The next prime is 43444422481. The reversal of 43444422421 is 12422444434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37058175025 + 6386247396 = 192505^2 + 79914^2 .

It is a cyclic number.

It is not a de Polignac number, because 43444422421 - 2¹¹ = 43444420373 is a prime.

It is a super-3 number, since 3×43444422421³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43444422481) 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 as a sum of consecutive naturals, namely, 21722211210 + 21722211211.

It is an arithmetic number, because the mean of its divisors is an integer number (21722211211).

Almost surely, 2^43444422421 is an apocalyptic number.

It is an amenable number.

43444422421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43444422421 is an equidigital number, since it uses as much as digits as its factorization.

43444422421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98304, while the sum is 34.

Adding to 43444422421 its reverse (12422444434), we get a palindrome (55866866855).

The spelling of 43444422421 in words is "forty-three billion, four hundred forty-four million, four hundred twenty-two thousand, four hundred twenty-one".