43424133421 has 2 divisors, whose sum is σ = 43424133422. Its totient is φ = 43424133420.

The previous prime is 43424133383. The next prime is 43424133427. The reversal of 43424133421 is 12433142434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42094728900 + 1329404521 = 205170^2 + 36461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43424133421 is a prime.

It is a super-3 number, since 3×43424133421³ (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 (43424133427) 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, 21712066710 + 21712066711.

It is an arithmetic number, because the mean of its divisors is an integer number (21712066711).

Almost surely, 2^43424133421 is an apocalyptic number.

It is an amenable number.

43424133421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43424133421 is an equidigital number, since it uses as much as digits as its factorization.

43424133421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 31.

Adding to 43424133421 its reverse (12433142434), we get a palindrome (55857275855).

The spelling of 43424133421 in words is "forty-three billion, four hundred twenty-four million, one hundred thirty-three thousand, four hundred twenty-one".