40045420321 has 2 divisors, whose sum is σ = 40045420322. Its totient is φ = 40045420320.

The previous prime is 40045420307. The next prime is 40045420351. The reversal of 40045420321 is 12302454004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20182464225 + 19862956096 = 142065^2 + 140936^2 .

It is a cyclic number.

It is not a de Polignac number, because 40045420321 - 2²¹ = 40043323169 is a prime.

It is not a weakly prime, because it can be changed into another prime (40045420351) 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, 20022710160 + 20022710161.

It is an arithmetic number, because the mean of its divisors is an integer number (20022710161).

Almost surely, 2^40045420321 is an apocalyptic number.

It is an amenable number.

40045420321 is a deficient number, since it is larger than the sum of its proper divisors (1).

40045420321 is an equidigital number, since it uses as much as digits as its factorization.

40045420321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 40045420321 its reverse (12302454004), we get a palindrome (52347874325).

The spelling of 40045420321 in words is "forty billion, forty-five million, four hundred twenty thousand, three hundred twenty-one".