40317021 has 10 divisors (see below), whose sum is σ = 60226782. Its totient is φ = 26877960.

The previous prime is 40317007. The next prime is 40317041. The reversal of 40317021 is 12071304.

40317021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 36360900 + 3956121 = 6030^2 + 1989^2 .

It is a de Polignac number, because none of the positive numbers 2^k-40317021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40316985 and 40317003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40317041) 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 9 ways as a sum of consecutive naturals, for example, 248790 + ... + 248951.

Almost surely, 2^40317021 is an apocalyptic number.

It is an amenable number.

40317021 is a deficient number, since it is larger than the sum of its proper divisors (19909761).

40317021 is an equidigital number, since it uses as much as digits as its factorization.

40317021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497753 (or 497744 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 40317021 is about 6349.5685680210. The cubic root of 40317021 is about 342.8963100344.

Adding to 40317021 its reverse (12071304), we get a palindrome (52388325).

It can be divided in two parts, 403 and 17021, that added together give a square (17424 = 132²).

The spelling of 40317021 in words is "forty million, three hundred seventeen thousand, twenty-one".