40023221 has 4 divisors (see below), whose sum is σ = 45740832. Its totient is φ = 34305612.

The previous prime is 40023209. The next prime is 40023223. The reversal of 40023221 is 12232004.

40023221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40023221 - 2⁶ = 40023157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40023196 and 40023205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40023223) 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 3 ways as a sum of consecutive naturals, for example, 2858795 + ... + 2858808.

It is an arithmetic number, because the mean of its divisors is an integer number (11435208).

Almost surely, 2^40023221 is an apocalyptic number.

It is an amenable number.

40023221 is a deficient number, since it is larger than the sum of its proper divisors (5717611).

40023221 is an equidigital number, since it uses as much as digits as its factorization.

40023221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5717610.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 40023221 is about 6326.3908352235. The cubic root of 40023221 is about 342.0613554524.

Adding to 40023221 its reverse (12232004), we get a palindrome (52255225).

The spelling of 40023221 in words is "forty million, twenty-three thousand, two hundred twenty-one".