43405321 has 2 divisors, whose sum is σ = 43405322. Its totient is φ = 43405320.

The previous prime is 43405309. The next prime is 43405387. The reversal of 43405321 is 12350434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43086096 + 319225 = 6564^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 43405321 - 2¹³ = 43397129 is a prime.

It is a super-2 number, since 2×43405321² = 3768043782226082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43405292 and 43405301.

It is not a weakly prime, because it can be changed into another prime (43405421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21702660 + 21702661.

It is an arithmetic number, because the mean of its divisors is an integer number (21702661).

Almost surely, 2^43405321 is an apocalyptic number.

It is an amenable number.

43405321 is a deficient number, since it is larger than the sum of its proper divisors (1).

43405321 is an equidigital number, since it uses as much as digits as its factorization.

43405321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 43405321 is about 6588.2714728523. The cubic root of 43405321 is about 351.4371411924.

Adding to 43405321 its reverse (12350434), we get a palindrome (55755755).

The spelling of 43405321 in words is "forty-three million, four hundred five thousand, three hundred twenty-one".