43338731021 has 2 divisors, whose sum is σ = 43338731022. Its totient is φ = 43338731020.

The previous prime is 43338731003. The next prime is 43338731089. The reversal of 43338731021 is 12013783334.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40114081225 + 3224649796 = 200285^2 + 56786^2 .

It is a cyclic number.

It is not a de Polignac number, because 43338731021 - 2⁶ = 43338730957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43338731221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21669365510 + 21669365511.

It is an arithmetic number, because the mean of its divisors is an integer number (21669365511).

Almost surely, 2^43338731021 is an apocalyptic number.

It is an amenable number.

43338731021 is a deficient number, since it is larger than the sum of its proper divisors (1).

43338731021 is an equidigital number, since it uses as much as digits as its factorization.

43338731021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 35.

The spelling of 43338731021 in words is "forty-three billion, three hundred thirty-eight million, seven hundred thirty-one thousand, twenty-one".