43421423009 has 2 divisors, whose sum is σ = 43421423010. Its totient is φ = 43421423008.

The previous prime is 43421422981. The next prime is 43421423033. The reversal of 43421423009 is 90032412434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22135488400 + 21285934609 = 148780^2 + 145897^2 .

It is a cyclic number.

It is not a de Polignac number, because 43421423009 - 2⁸ = 43421422753 is a prime.

It is a super-2 number, since 2×43421423009² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43421423039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21710711504 + 21710711505.

It is an arithmetic number, because the mean of its divisors is an integer number (21710711505).

Almost surely, 2^43421423009 is an apocalyptic number.

It is an amenable number.

43421423009 is a deficient number, since it is larger than the sum of its proper divisors (1).

43421423009 is an equidigital number, since it uses as much as digits as its factorization.

43421423009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 32.

The spelling of 43421423009 in words is "forty-three billion, four hundred twenty-one million, four hundred twenty-three thousand, nine".