40171021 has 8 divisors (see below), whose sum is σ = 44892288. Its totient is φ = 35628000.

The previous prime is 40171013. The next prime is 40171031. The reversal of 40171021 is 12017104.

40171021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40171021 - 2³ = 40171013 is a prime.

It is a super-2 number, since 2×40171021² = 3227421856364882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40170986 and 40171004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40171031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44085 + ... + 44986.

It is an arithmetic number, because the mean of its divisors is an integer number (5611536).

Almost surely, 2^40171021 is an apocalyptic number.

40171021 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40171021 is a deficient number, since it is larger than the sum of its proper divisors (4721267).

40171021 is a wasteful number, since it uses less digits than its factorization.

40171021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89123.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 40171021 is about 6338.0612966427. The cubic root of 40171021 is about 342.4818993400.

Adding to 40171021 its reverse (12017104), we get a palindrome (52188125).

The spelling of 40171021 in words is "forty million, one hundred seventy-one thousand, twenty-one".