40321221 has 4 divisors (see below), whose sum is σ = 53761632. Its totient is φ = 26880812.

The previous prime is 40321219. The next prime is 40321241. The reversal of 40321221 is 12212304.

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 40321221 - 2¹ = 40321219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40321221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40321201) 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 3 ways as a sum of consecutive naturals, for example, 6720201 + ... + 6720206.

It is an arithmetic number, because the mean of its divisors is an integer number (13440408).

Almost surely, 2^40321221 is an apocalyptic number.

It is an amenable number.

40321221 is a deficient number, since it is larger than the sum of its proper divisors (13440411).

40321221 is a wasteful number, since it uses less digits than its factorization.

40321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13440410.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 40321221 is about 6349.8992905400. The cubic root of 40321221 is about 342.9082166226.

Adding to 40321221 its reverse (12212304), we get a palindrome (52533525).

It can be divided in two parts, 4032 and 1221, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 40321221 in words is "forty million, three hundred twenty-one thousand, two hundred twenty-one".