43330421 has 2 divisors, whose sum is σ = 43330422. Its totient is φ = 43330420.

The previous prime is 43330411. The next prime is 43330439. The reversal of 43330421 is 12403334.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25140196 + 18190225 = 5014^2 + 4265^2 .

It is a cyclic number.

It is not a de Polignac number, because 43330421 - 2²² = 39136117 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 43330393 and 43330402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43330411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21665210 + 21665211.

It is an arithmetic number, because the mean of its divisors is an integer number (21665211).

Almost surely, 2^43330421 is an apocalyptic number.

It is an amenable number.

43330421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43330421 is an equidigital number, since it uses as much as digits as its factorization.

43330421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 43330421 is about 6582.5846747307. The cubic root of 43330421 is about 351.2348787621.

Adding to 43330421 its reverse (12403334), we get a palindrome (55733755).

The spelling of 43330421 in words is "forty-three million, three hundred thirty thousand, four hundred twenty-one".