40036126021 has 2 divisors, whose sum is σ = 40036126022. Its totient is φ = 40036126020.

The previous prime is 40036126007. The next prime is 40036126129. The reversal of 40036126021 is 12062163004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37486380996 + 2549745025 = 193614^2 + 50495^2 .

It is a cyclic number.

It is not a de Polignac number, because 40036126021 - 2⁹ = 40036125509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40036126421) 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, 20018063010 + 20018063011.

It is an arithmetic number, because the mean of its divisors is an integer number (20018063011).

Almost surely, 2^40036126021 is an apocalyptic number.

It is an amenable number.

40036126021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40036126021 is an equidigital number, since it uses as much as digits as its factorization.

40036126021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 40036126021 its reverse (12062163004), we get a palindrome (52098289025).

The spelling of 40036126021 in words is "forty billion, thirty-six million, one hundred twenty-six thousand, twenty-one".