221522402 has 8 divisors (see below), whose sum is σ = 333774336. Its totient is φ = 110264292.

The previous prime is 221522401. The next prime is 221522429. The reversal of 221522402 is 204225122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (221522401) 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, 247898 + ... + 248789.

It is an arithmetic number, because the mean of its divisors is an integer number (41721792).

Almost surely, 2^221522402 is an apocalyptic number.

221522402 is a deficient number, since it is larger than the sum of its proper divisors (112251934).

221522402 is a wasteful number, since it uses less digits than its factorization.

221522402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496912.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 221522402 is about 14883.6286570178. The cubic root of 221522402 is about 605.0703667898.

Adding to 221522402 its reverse (204225122), we get a palindrome (425747524).

The spelling of 221522402 in words is "two hundred twenty-one million, five hundred twenty-two thousand, four hundred two".