221642022 has 32 divisors (see below), whose sum is σ = 536412672. Its totient is φ = 59601024.

The previous prime is 221642009. The next prime is 221642059. The reversal of 221642022 is 220246122.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 221642022.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154498 + ... + 155925.

It is an arithmetic number, because the mean of its divisors is an integer number (16762896).

Almost surely, 2^221642022 is an apocalyptic number.

221642022 is an abundant number, since it is smaller than the sum of its proper divisors (314770650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221642022 is a wasteful number, since it uses less digits than its factorization.

221642022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310452.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 221642022 is about 14887.6466239631. The cubic root of 221642022 is about 605.1792579488.

Adding to 221642022 its reverse (220246122), we get a palindrome (441888144).

The spelling of 221642022 in words is "two hundred twenty-one million, six hundred forty-two thousand, twenty-two".