43435421 has 2 divisors, whose sum is σ = 43435422. Its totient is φ = 43435420.

The previous prime is 43435411. The next prime is 43435423. The reversal of 43435421 is 12453434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43375396 + 60025 = 6586^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 43435421 - 2¹⁰ = 43434397 is a prime.

Together with 43435423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43435423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21717710 + 21717711.

It is an arithmetic number, because the mean of its divisors is an integer number (21717711).

Almost surely, 2^43435421 is an apocalyptic number.

It is an amenable number.

43435421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43435421 is an equidigital number, since it uses as much as digits as its factorization.

43435421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 26.

The square root of 43435421 is about 6590.5554394148. Note that the first 3 decimals coincide. The cubic root of 43435421 is about 351.5183586825.

Adding to 43435421 its reverse (12453434), we get a palindrome (55888855).

The spelling of 43435421 in words is "forty-three million, four hundred thirty-five thousand, four hundred twenty-one".