40021326173 has 2 divisors, whose sum is σ = 40021326174. Its totient is φ = 40021326172.

The previous prime is 40021326139. The next prime is 40021326179. The reversal of 40021326173 is 37162312004.

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., 23022903289 + 16998422884 = 151733^2 + 130378^2 .

It is a cyclic number.

It is not a de Polignac number, because 40021326173 - 2⁶ = 40021326109 is a prime.

It is a super-3 number, since 3×40021326173³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40021326179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20010663086 + 20010663087.

It is an arithmetic number, because the mean of its divisors is an integer number (20010663087).

Almost surely, 2^40021326173 is an apocalyptic number.

It is an amenable number.

40021326173 is a deficient number, since it is larger than the sum of its proper divisors (1).

40021326173 is an equidigital number, since it uses as much as digits as its factorization.

40021326173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

Adding to 40021326173 its reverse (37162312004), we get a palindrome (77183638177).

The spelling of 40021326173 in words is "forty billion, twenty-one million, three hundred twenty-six thousand, one hundred seventy-three".