40111166021 has 2 divisors, whose sum is σ = 40111166022. Its totient is φ = 40111166020.

The previous prime is 40111165993. The next prime is 40111166047. The reversal of 40111166021 is 12066111104.

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., 24738885796 + 15372280225 = 157286^2 + 123985^2 .

It is a cyclic number.

It is not a de Polignac number, because 40111166021 - 2³⁰ = 39037424197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40111166621) 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, 20055583010 + 20055583011.

It is an arithmetic number, because the mean of its divisors is an integer number (20055583011).

Almost surely, 2^40111166021 is an apocalyptic number.

It is an amenable number.

40111166021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40111166021 is an equidigital number, since it uses as much as digits as its factorization.

40111166021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 40111166021 its reverse (12066111104), we get a palindrome (52177277125).

The spelling of 40111166021 in words is "forty billion, one hundred eleven million, one hundred sixty-six thousand, twenty-one".