40044044021 has 2 divisors, whose sum is σ = 40044044022. Its totient is φ = 40044044020.

The previous prime is 40044043979. The next prime is 40044044069. The reversal of 40044044021 is 12044044004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21660480625 + 18383563396 = 147175^2 + 135586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40044044021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40044040021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20022022010 + 20022022011.

It is an arithmetic number, because the mean of its divisors is an integer number (20022022011).

Almost surely, 2^40044044021 is an apocalyptic number.

It is an amenable number.

40044044021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40044044021 is an equidigital number, since it uses as much as digits as its factorization.

40044044021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 40044044021 its reverse (12044044004), we get a palindrome (52088088025).

The spelling of 40044044021 in words is "forty billion, forty-four million, forty-four thousand, twenty-one".