40021326109 has 2 divisors, whose sum is σ = 40021326110. Its totient is φ = 40021326108.

The previous prime is 40021326073. The next prime is 40021326113. The reversal of 40021326109 is 90162312004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30536514009 + 9484812100 = 174747^2 + 97390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40021326109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40021326139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20010663054 + 20010663055.

It is an arithmetic number, because the mean of its divisors is an integer number (20010663055).

Almost surely, 2^40021326109 is an apocalyptic number.

It is an amenable number.

40021326109 is a deficient number, since it is larger than the sum of its proper divisors (1).

40021326109 is an equidigital number, since it uses as much as digits as its factorization.

40021326109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 40021326109 in words is "forty billion, twenty-one million, three hundred twenty-six thousand, one hundred nine".