40242021 has 8 divisors (see below), whose sum is σ = 54066144. Its totient is φ = 26622960.

The previous prime is 40241989. The next prime is 40242079. The reversal of 40242021 is 12024204.

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

It is not a de Polignac number, because 40242021 - 2⁵ = 40241989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40242221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50806 + ... + 51591.

It is an arithmetic number, because the mean of its divisors is an integer number (6758268).

Almost surely, 2^40242021 is an apocalyptic number.

It is an amenable number.

40242021 is a deficient number, since it is larger than the sum of its proper divisors (13824123).

40242021 is a wasteful number, since it uses less digits than its factorization.

40242021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102531.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 40242021 is about 6343.6599057642. The cubic root of 40242021 is about 342.6835530235.

Adding to 40242021 its reverse (12024204), we get a palindrome (52266225).

The spelling of 40242021 in words is "forty million, two hundred forty-two thousand, twenty-one".