420140221 has 4 divisors (see below), whose sum is σ = 420284700. Its totient is φ = 419995744.

The previous prime is 420140219. The next prime is 420140297. The reversal of 420140221 is 122041024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86676100 + 333464121 = 9310^2 + 18261^2 .

It is a cyclic number.

It is not a de Polignac number, because 420140221 - 2¹ = 420140219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420140195 and 420140204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420140621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67786 + ... + 73723.

It is an arithmetic number, because the mean of its divisors is an integer number (105071175).

Almost surely, 2^420140221 is an apocalyptic number.

It is an amenable number.

420140221 is a deficient number, since it is larger than the sum of its proper divisors (144479).

420140221 is a wasteful number, since it uses less digits than its factorization.

420140221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144478.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 420140221 is about 20497.3222885332. The cubic root of 420140221 is about 748.9705704945.

Adding to 420140221 its reverse (122041024), we get a palindrome (542181245).

The spelling of 420140221 in words is "four hundred twenty million, one hundred forty thousand, two hundred twenty-one".