40245021 has 24 divisors (see below), whose sum is σ = 62244000. Its totient is φ = 24980832.

The previous prime is 40245017. The next prime is 40245047. The reversal of 40245021 is 12054204.

40245021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40245021 - 2² = 40245017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40244985 and 40245003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40245071) 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 23 ways as a sum of consecutive naturals, for example, 8095 + ... + 12083.

It is an arithmetic number, because the mean of its divisors is an integer number (2593500).

Almost surely, 2^40245021 is an apocalyptic number.

It is an amenable number.

40245021 is a deficient number, since it is larger than the sum of its proper divisors (21998979).

40245021 is a wasteful number, since it uses less digits than its factorization.

40245021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4073 (or 4070 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 40245021 is about 6343.8963579176. The cubic root of 40245021 is about 342.6920683771.

Adding to 40245021 its reverse (12054204), we get a palindrome (52299225).

It can be divided in two parts, 4024 and 5021, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 40245021 in words is "forty million, two hundred forty-five thousand, twenty-one".