400330221 has 4 divisors (see below), whose sum is σ = 533773632. Its totient is φ = 266886812.

The previous prime is 400330219. The next prime is 400330237. The reversal of 400330221 is 122033004.

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 400330221 - 2¹ = 400330219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400330221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400330241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66721701 + ... + 66721706.

It is an arithmetic number, because the mean of its divisors is an integer number (133443408).

Almost surely, 2^400330221 is an apocalyptic number.

It is an amenable number.

400330221 is a deficient number, since it is larger than the sum of its proper divisors (133443411).

400330221 is a wasteful number, since it uses less digits than its factorization.

400330221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133443410.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 400330221 is about 20008.2538218606. The cubic root of 400330221 is about 737.0090013856.

Adding to 400330221 its reverse (122033004), we get a palindrome (522363225).

The spelling of 400330221 in words is "four hundred million, three hundred thirty thousand, two hundred twenty-one".