40220421 has 4 divisors (see below), whose sum is σ = 53627232. Its totient is φ = 26813612.

The previous prime is 40220407. The next prime is 40220441. The reversal of 40220421 is 12402204.

40220421 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 40220421 - 2¹⁴ = 40204037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40220421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40220441) 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, 6703401 + ... + 6703406.

It is an arithmetic number, because the mean of its divisors is an integer number (13406808).

Almost surely, 2^40220421 is an apocalyptic number.

It is an amenable number.

40220421 is a deficient number, since it is larger than the sum of its proper divisors (13406811).

40220421 is a wasteful number, since it uses less digits than its factorization.

40220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13406810.

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

The square root of 40220421 is about 6341.9571900163. The cubic root of 40220421 is about 342.6222299811.

Adding to 40220421 its reverse (12402204), we get a palindrome (52622625).

The spelling of 40220421 in words is "forty million, two hundred twenty thousand, four hundred twenty-one".