44243420021 has 2 divisors, whose sum is σ = 44243420022. Its totient is φ = 44243420020.

The previous prime is 44243419943. The next prime is 44243420027. The reversal of 44243420021 is 12002434244.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43393056100 + 850363921 = 208310^2 + 29161^2 .

It is a cyclic number.

It is not a de Polignac number, because 44243420021 - 2¹⁴ = 44243403637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44243420027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22121710010 + 22121710011.

It is an arithmetic number, because the mean of its divisors is an integer number (22121710011).

Almost surely, 2^44243420021 is an apocalyptic number.

It is an amenable number.

44243420021 is a deficient number, since it is larger than the sum of its proper divisors (1).

44243420021 is an equidigital number, since it uses as much as digits as its factorization.

44243420021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 44243420021 its reverse (12002434244), we get a palindrome (56245854265).

The spelling of 44243420021 in words is "forty-four billion, two hundred forty-three million, four hundred twenty thousand, twenty-one".