43143421 has 2 divisors, whose sum is σ = 43143422. Its totient is φ = 43143420.

The previous prime is 43143407. The next prime is 43143437. The reversal of 43143421 is 12434134.

43143421 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., 32832900 + 10310521 = 5730^2 + 3211^2 .

It is a cyclic number.

It is not a de Polignac number, because 43143421 - 2⁷ = 43143293 is a prime.

It is a super-2 number, since 2×43143421² = 3722709551166482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43143392 and 43143401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43143461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21571710 + 21571711.

It is an arithmetic number, because the mean of its divisors is an integer number (21571711).

Almost surely, 2^43143421 is an apocalyptic number.

It is an amenable number.

43143421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43143421 is an equidigital number, since it uses as much as digits as its factorization.

43143421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 22.

The square root of 43143421 is about 6568.3651695076. The cubic root of 43143421 is about 350.7288783292.

Adding to 43143421 its reverse (12434134), we get a palindrome (55577555).

The spelling of 43143421 in words is "forty-three million, one hundred forty-three thousand, four hundred twenty-one".