40021202173 has 2 divisors, whose sum is σ = 40021202174. Its totient is φ = 40021202172.

The previous prime is 40021202087. The next prime is 40021202269. The reversal of 40021202173 is 37120212004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32988367129 + 7032835044 = 181627^2 + 83862^2 .

It is a cyclic number.

It is not a de Polignac number, because 40021202173 - 2¹³ = 40021193981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40021002173) 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, 20010601086 + 20010601087.

It is an arithmetic number, because the mean of its divisors is an integer number (20010601087).

Almost surely, 2^40021202173 is an apocalyptic number.

It is an amenable number.

40021202173 is a deficient number, since it is larger than the sum of its proper divisors (1).

40021202173 is an equidigital number, since it uses as much as digits as its factorization.

40021202173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

Adding to 40021202173 its reverse (37120212004), we get a palindrome (77141414177).

The spelling of 40021202173 in words is "forty billion, twenty-one million, two hundred two thousand, one hundred seventy-three".