43012421 has 2 divisors, whose sum is σ = 43012422. Its totient is φ = 43012420.

The previous prime is 43012399. The next prime is 43012429. The reversal of 43012421 is 12421034.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26112100 + 16900321 = 5110^2 + 4111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43012421 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43012421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43012429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21506210 + 21506211.

It is an arithmetic number, because the mean of its divisors is an integer number (21506211).

Almost surely, 2^43012421 is an apocalyptic number.

It is an amenable number.

43012421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43012421 is an equidigital number, since it uses as much as digits as its factorization.

43012421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 43012421 is about 6558.3855482885. The cubic root of 43012421 is about 350.3735358976.

Adding to 43012421 its reverse (12421034), we get a palindrome (55433455).

The spelling of 43012421 in words is "forty-three million, twelve thousand, four hundred twenty-one".