43124821 has 2 divisors, whose sum is σ = 43124822. Its totient is φ = 43124820.

The previous prime is 43124797. The next prime is 43124831. The reversal of 43124821 is 12842134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41460721 + 1664100 = 6439^2 + 1290^2 .

It is a cyclic number.

It is not a de Polignac number, because 43124821 - 2⁹ = 43124309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43124831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21562410 + 21562411.

It is an arithmetic number, because the mean of its divisors is an integer number (21562411).

Almost surely, 2^43124821 is an apocalyptic number.

It is an amenable number.

43124821 is a deficient number, since it is larger than the sum of its proper divisors (1).

43124821 is an equidigital number, since it uses as much as digits as its factorization.

43124821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 25.

The square root of 43124821 is about 6566.9491394406. The cubic root of 43124821 is about 350.6784689837.

Adding to 43124821 its reverse (12842134), we get a palindrome (55966955).

It can be divided in two parts, 431 and 24821, that added together give a palindrome (25252).

The spelling of 43124821 in words is "forty-three million, one hundred twenty-four thousand, eight hundred twenty-one".