40240221 has 24 divisors (see below), whose sum is σ = 62654400. Its totient is φ = 22905792.

The previous prime is 40240181. The next prime is 40240223. The reversal of 40240221 is 12204204.

It is not a de Polignac number, because 40240221 - 2⁷ = 40240093 is a prime.

It is a super-2 number, since 2×40240221² = 3238550772257682, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40240221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40240223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66880 + ... + 67478.

It is an arithmetic number, because the mean of its divisors is an integer number (2610600).

Almost surely, 2^40240221 is an apocalyptic number.

It is an amenable number.

40240221 is a deficient number, since it is larger than the sum of its proper divisors (22414179).

40240221 is a wasteful number, since it uses less digits than its factorization.

40240221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073 (or 1066 counting only the distinct ones).

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

The square root of 40240221 is about 6343.5180302416. The cubic root of 40240221 is about 342.6784436082.

Adding to 40240221 its reverse (12204204), we get a palindrome (52444425).

The spelling of 40240221 in words is "forty million, two hundred forty thousand, two hundred twenty-one".