43442041421 has 2 divisors, whose sum is σ = 43442041422. Its totient is φ = 43442041420.

The previous prime is 43442041403. The next prime is 43442041439. The reversal of 43442041421 is 12414024434.

43442041421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (43442041403) and next prime (43442041439).

It can be written as a sum of positive squares in only one way, i.e., 21748875625 + 21693165796 = 147475^2 + 147286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43442041421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43442041471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21721020710 + 21721020711.

It is an arithmetic number, because the mean of its divisors is an integer number (21721020711).

Almost surely, 2^43442041421 is an apocalyptic number.

It is an amenable number.

43442041421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43442041421 is an equidigital number, since it uses as much as digits as its factorization.

43442041421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 43442041421 its reverse (12414024434), we get a palindrome (55856065855).

The spelling of 43442041421 in words is "forty-three billion, four hundred forty-two million, forty-one thousand, four hundred twenty-one".