402224221 has 16 divisors (see below), whose sum is σ = 463606144. Its totient is φ = 341838144.

The previous prime is 402224203. The next prime is 402224239. The reversal of 402224221 is 122422204.

It is an interprime number because it is at equal distance from previous prime (402224203) and next prime (402224239).

It is a cyclic number.

It is not a de Polignac number, because 402224221 - 2⁵ = 402224189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402224201) 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 15 ways as a sum of consecutive naturals, for example, 548371 + ... + 549103.

It is an arithmetic number, because the mean of its divisors is an integer number (28975384).

Almost surely, 2^402224221 is an apocalyptic number.

It is an amenable number.

402224221 is a deficient number, since it is larger than the sum of its proper divisors (61381923).

402224221 is a wasteful number, since it uses less digits than its factorization.

402224221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 402224221 is about 20055.5284398093. The cubic root of 402224221 is about 738.1694595716.

Adding to 402224221 its reverse (122422204), we get a palindrome (524646425).

The spelling of 402224221 in words is "four hundred two million, two hundred twenty-four thousand, two hundred twenty-one".